diff --git a/src/DownloadEngine.cc b/src/DownloadEngine.cc
index 347bce6a..23112f59 100644
--- a/src/DownloadEngine.cc
+++ b/src/DownloadEngine.cc
@@ -578,10 +578,9 @@ void DownloadEngine::addCommand(std::unique_ptr<Command> command)
   commands_.push_back(std::move(command));
 }
 
-void DownloadEngine::setRequestGroupMan
-(const std::shared_ptr<RequestGroupMan>& rgman)
+void DownloadEngine::setRequestGroupMan(std::unique_ptr<RequestGroupMan> rgman)
 {
-  requestGroupMan_ = rgman;
+  requestGroupMan_ = std::move(rgman);
 }
 
 void DownloadEngine::setFileAllocationMan
diff --git a/src/DownloadEngine.h b/src/DownloadEngine.h
index 29503fd7..6dbd341c 100644
--- a/src/DownloadEngine.h
+++ b/src/DownloadEngine.h
@@ -168,7 +168,7 @@ private:
   findSocketPoolEntry(const std::string& key);
 
   std::deque<std::unique_ptr<Command>> commands_;
-  std::shared_ptr<RequestGroupMan> requestGroupMan_;
+  std::unique_ptr<RequestGroupMan> requestGroupMan_;
   std::unique_ptr<FileAllocationMan> fileAllocationMan_;
   std::unique_ptr<CheckIntegrityMan> checkIntegrityMan_;
   Option* option_;
@@ -204,12 +204,12 @@ public:
 
   void addCommand(std::unique_ptr<Command> command);
 
-  const std::shared_ptr<RequestGroupMan>& getRequestGroupMan() const
+  const std::unique_ptr<RequestGroupMan>& getRequestGroupMan() const
   {
     return requestGroupMan_;
   }
 
-  void setRequestGroupMan(const std::shared_ptr<RequestGroupMan>& rgman);
+  void setRequestGroupMan(std::unique_ptr<RequestGroupMan> rgman);
 
   const std::unique_ptr<FileAllocationMan>& getFileAllocationMan() const
   {
diff --git a/src/DownloadEngineFactory.cc b/src/DownloadEngineFactory.cc
index 0227e061..49e9a4bf 100644
--- a/src/DownloadEngineFactory.cc
+++ b/src/DownloadEngineFactory.cc
@@ -148,11 +148,12 @@ DownloadEngineFactory::newDownloadEngine
           }
   std::shared_ptr<DownloadEngine> e(new DownloadEngine(eventPoll));
   e->setOption(op);
-
-  auto requestGroupMan = std::make_shared<RequestGroupMan>
-    (std::move(requestGroups), MAX_CONCURRENT_DOWNLOADS, op);
-  requestGroupMan->initWrDiskCache();
-  e->setRequestGroupMan(requestGroupMan);
+  {
+    auto requestGroupMan = make_unique<RequestGroupMan>
+      (std::move(requestGroups), MAX_CONCURRENT_DOWNLOADS, op);
+    requestGroupMan->initWrDiskCache();
+    e->setRequestGroupMan(std::move(requestGroupMan));
+  }
   e->setFileAllocationMan(make_unique<FileAllocationMan>());
 #ifdef ENABLE_MESSAGE_DIGEST
   e->setCheckIntegrityMan(make_unique<CheckIntegrityMan>());
diff --git a/src/FillRequestGroupCommand.cc b/src/FillRequestGroupCommand.cc
index 3aa12d0d..f40c8fe6 100644
--- a/src/FillRequestGroupCommand.cc
+++ b/src/FillRequestGroupCommand.cc
@@ -60,7 +60,7 @@ bool FillRequestGroupCommand::execute()
   if(e_->isHaltRequested()) {
     return true;
   }
-  const std::shared_ptr<RequestGroupMan>& rgman = e_->getRequestGroupMan();
+  auto& rgman = e_->getRequestGroupMan();
   if(rgman->queueCheckRequested()) {
     while(rgman->queueCheckRequested()) {
       try {
diff --git a/src/MultiUrlRequestInfo.cc b/src/MultiUrlRequestInfo.cc
index 8517b045..74ab10d5 100644
--- a/src/MultiUrlRequestInfo.cc
+++ b/src/MultiUrlRequestInfo.cc
@@ -288,7 +288,7 @@ error_code::Value MultiUrlRequestInfo::getResult()
       returnValue = s.getLastErrorResult();
     }
   }
-  SessionSerializer sessionSerializer(e_->getRequestGroupMan());
+  SessionSerializer sessionSerializer{e_->getRequestGroupMan().get()};
   // TODO Add option: --save-session-status=error,inprogress,waiting
   if(!option_->blank(PREF_SAVE_SESSION)) {
     const std::string& filename = option_->get(PREF_SAVE_SESSION);
diff --git a/src/RpcMethodImpl.cc b/src/RpcMethodImpl.cc
index 43d8748d..dd189563 100644
--- a/src/RpcMethodImpl.cc
+++ b/src/RpcMethodImpl.cc
@@ -1351,7 +1351,7 @@ std::shared_ptr<ValueBase> ForceShutdownRpcMethod::process
 std::shared_ptr<ValueBase> GetGlobalStatRpcMethod::process
 (const RpcRequest& req, DownloadEngine* e)
 {
-  const std::shared_ptr<RequestGroupMan>& rgman = e->getRequestGroupMan();
+  auto& rgman = e->getRequestGroupMan();
   TransferStat ts = rgman->calculateStat();
   std::shared_ptr<Dict> res = Dict::g();
   res->put(KEY_DOWNLOAD_SPEED, util::itos(ts.downloadSpeed));
diff --git a/src/SaveSessionCommand.cc b/src/SaveSessionCommand.cc
index 2d990532..a09811e5 100644
--- a/src/SaveSessionCommand.cc
+++ b/src/SaveSessionCommand.cc
@@ -64,7 +64,7 @@ void SaveSessionCommand::process()
     ->get(PREF_SAVE_SESSION);
   if(!filename.empty()) {
     SessionSerializer sessionSerializer(getDownloadEngine()->
-                                        getRequestGroupMan());
+                                        getRequestGroupMan().get());
     if(sessionSerializer.save(filename)) {
       A2_LOG_NOTICE(fmt(_("Serialized session to '%s' successfully."),
                         filename.c_str()));
diff --git a/src/SessionSerializer.cc b/src/SessionSerializer.cc
index 17bdef65..0d78b945 100644
--- a/src/SessionSerializer.cc
+++ b/src/SessionSerializer.cc
@@ -60,11 +60,12 @@
 namespace aria2 {
 
 SessionSerializer::SessionSerializer
-(const std::shared_ptr<RequestGroupMan>& requestGroupMan):
-  rgman_(requestGroupMan),
-  saveError_(true),
-  saveInProgress_(true),
-  saveWaiting_(true) {}
+(RequestGroupMan* requestGroupMan)
+  : rgman_{requestGroupMan},
+    saveError_{true},
+    saveInProgress_{true},
+    saveWaiting_{true}
+{}
 
 bool SessionSerializer::save(const std::string& filename) const
 {
diff --git a/src/SessionSerializer.h b/src/SessionSerializer.h
index a72aafdf..c3493edc 100644
--- a/src/SessionSerializer.h
+++ b/src/SessionSerializer.h
@@ -48,13 +48,13 @@ class IOFile;
 
 class SessionSerializer {
 private:
-  std::shared_ptr<RequestGroupMan> rgman_;
+  RequestGroupMan* rgman_;
   bool saveError_;
   bool saveInProgress_;
   bool saveWaiting_;
   bool save(IOFile& fp) const;
 public:
-  SessionSerializer(const std::shared_ptr<RequestGroupMan>& requestGroupMan);
+  SessionSerializer(RequestGroupMan* requestGroupMan);
 
   bool save(const std::string& filename) const;
 };
diff --git a/src/aria2api.cc b/src/aria2api.cc
index 980e3c45..0443ebfb 100644
--- a/src/aria2api.cc
+++ b/src/aria2api.cc
@@ -525,7 +525,7 @@ GlobalStat getGlobalStat(Session* session)
 {
   const std::shared_ptr<DownloadEngine>& e =
     session->context->reqinfo->getDownloadEngine();
-  const std::shared_ptr<RequestGroupMan>& rgman = e->getRequestGroupMan();
+  auto& rgman = e->getRequestGroupMan();
   TransferStat ts = rgman->calculateStat();
   GlobalStat res;
   res.downloadSpeed = ts.downloadSpeed;
@@ -945,7 +945,7 @@ DownloadHandle* getDownloadHandle(Session* session, A2Gid gid)
 {
   const std::shared_ptr<DownloadEngine>& e =
     session->context->reqinfo->getDownloadEngine();
-  const std::shared_ptr<RequestGroupMan>& rgman = e->getRequestGroupMan();
+  auto& rgman = e->getRequestGroupMan();
   std::shared_ptr<RequestGroup> group = rgman->findGroup(gid);
   if(group) {
     return new RequestGroupDH(group);
diff --git a/test/Aria2ApiTest.cc b/test/Aria2ApiTest.cc
index e84482d5..fecf0f52 100644
--- a/test/Aria2ApiTest.cc
+++ b/test/Aria2ApiTest.cc
@@ -235,7 +235,7 @@ void Aria2ApiTest::testDownloadResultDH()
   std::shared_ptr<DownloadResult> dr2 =
     createDownloadResult(error_code::NETWORK_PROBLEM,
                          "http://example.org/network");
-  std::shared_ptr<RequestGroupMan> gman =
+  auto& gman =
     session_->context->reqinfo->getDownloadEngine()->getRequestGroupMan();
   gman->addDownloadResult(dr1);
   gman->addDownloadResult(dr2);
diff --git a/test/RequestGroupManTest.cc b/test/RequestGroupManTest.cc
index b64c0390..47f22959 100644
--- a/test/RequestGroupManTest.cc
+++ b/test/RequestGroupManTest.cc
@@ -37,24 +37,23 @@ class RequestGroupManTest : public CppUnit::TestFixture {
   CPPUNIT_TEST(testAddDownloadResult);
   CPPUNIT_TEST_SUITE_END();
 private:
-  std::shared_ptr<DownloadEngine> e_;
+  std::unique_ptr<DownloadEngine> e_;
   std::shared_ptr<Option> option_;
-  std::shared_ptr<RequestGroupMan> rgman_;
+  RequestGroupMan* rgman_;
 public:
   void setUp()
   {
-    option_.reset(new Option());
+    option_ = std::make_shared<Option>();
     option_->put(PREF_PIECE_LENGTH, "1048576");
     // To enable paused RequestGroup
     option_->put(PREF_ENABLE_RPC, A2_V_TRUE);
     File(option_->get(PREF_DIR)).mkdirs();
-    e_.reset
-      (new DownloadEngine(std::shared_ptr<EventPoll>(new SelectEventPoll())));
+    e_ = make_unique<DownloadEngine>(std::make_shared<SelectEventPoll>());
     e_->setOption(option_.get());
-    rgman_ = std::shared_ptr<RequestGroupMan>
-      (new RequestGroupMan(std::vector<std::shared_ptr<RequestGroup> >(),
-                           3, option_.get()));
-    e_->setRequestGroupMan(rgman_);
+    auto rgman = make_unique<RequestGroupMan>
+      (std::vector<std::shared_ptr<RequestGroup>>{}, 3, option_.get());
+    rgman_ = rgman.get();
+    e_->setRequestGroupMan(std::move(rgman));
   }
 
   void testIsSameFileBeingDownloaded();
diff --git a/test/RpcMethodTest.cc b/test/RpcMethodTest.cc
index c56f55fd..c5c4520b 100644
--- a/test/RpcMethodTest.cc
+++ b/test/RpcMethodTest.cc
@@ -84,18 +84,16 @@ private:
 public:
   void setUp()
   {
-    option_.reset(new Option());
+    option_ = std::make_shared<Option>();
     option_->put(PREF_DIR, A2_TEST_OUT_DIR"/aria2_RpcMethodTest");
     option_->put(PREF_PIECE_LENGTH, "1048576");
     option_->put(PREF_MAX_DOWNLOAD_RESULT, "10");
     File(option_->get(PREF_DIR)).mkdirs();
-    e_.reset
-      (new DownloadEngine(std::shared_ptr<EventPoll>(new SelectEventPoll())));
+    e_ = make_unique<DownloadEngine>(std::make_shared<SelectEventPoll>());
     e_->setOption(option_.get());
     e_->setRequestGroupMan
-      (std::shared_ptr<RequestGroupMan>
-       (new RequestGroupMan(std::vector<std::shared_ptr<RequestGroup> >(),
-                            1, option_.get())));
+      (make_unique<RequestGroupMan>
+       (std::vector<std::shared_ptr<RequestGroup>>{}, 1, option_.get()));
   }
 
   void testAddUri();
@@ -182,7 +180,8 @@ void RpcMethodTest::testAddUri()
     CPPUNIT_ASSERT_EQUAL(0, GroupId::toNumericId
                          (gid, downcast<String>(res.param)->s().c_str()));
     CPPUNIT_ASSERT_EQUAL(std::string("/sink"),
-                         findReservedGroup(e_->getRequestGroupMan(), gid)->
+                         findReservedGroup(e_->getRequestGroupMan().get(),
+                                           gid)->
                          getOption()->get(PREF_DIR));
   }
 }
@@ -239,7 +238,7 @@ void RpcMethodTest::testAddUri_withPosition()
   m.execute(req2, e_.get());
 
   std::string uri =
-    getReservedGroup(e_->getRequestGroupMan(), 0)->
+    getReservedGroup(e_->getRequestGroupMan().get(), 0)->
     getDownloadContext()->getFirstFileEntry()->getRemainingUris()[0];
 
   CPPUNIT_ASSERT_EQUAL(std::string("http://uri2"), uri);
@@ -290,8 +289,7 @@ void RpcMethodTest::testAddTorrent()
     CPPUNIT_ASSERT_EQUAL(0, GroupId::toNumericId
                          (gid, downcast<String>(res.param)->s().c_str()));
 
-    std::shared_ptr<RequestGroup> group =
-      findReservedGroup(e_->getRequestGroupMan(), gid);
+    auto group = findReservedGroup(e_->getRequestGroupMan().get(), gid);
     CPPUNIT_ASSERT(group);
     CPPUNIT_ASSERT_EQUAL(e_->getOption()->get(PREF_DIR)+"/aria2-0.8.2.tar.bz2",
                          group->getFirstFilePath());
@@ -317,7 +315,8 @@ void RpcMethodTest::testAddTorrent()
                          (gid, downcast<String>(res.param)->s().c_str()));
     CPPUNIT_ASSERT_EQUAL
       (dir+"/aria2-0.8.2.tar.bz2",
-       findReservedGroup(e_->getRequestGroupMan(), gid)->getFirstFilePath());
+       findReservedGroup(e_->getRequestGroupMan().get(), gid)
+       ->getFirstFilePath());
     CPPUNIT_ASSERT
       (File(dir+"/0a3893293e27ac0490424c06de4d09242215f0a6.torrent").exists());
   }
@@ -358,7 +357,7 @@ void RpcMethodTest::testAddTorrent_withPosition()
   m.execute(req2, e_.get());
 
   CPPUNIT_ASSERT_EQUAL((size_t)1,
-                       getReservedGroup(e_->getRequestGroupMan(), 0)->
+                       getReservedGroup(e_->getRequestGroupMan().get(), 0)->
                        getDownloadContext()->getFileEntries().size());
 }
 
@@ -408,13 +407,11 @@ void RpcMethodTest::testAddMetalink()
             "/c908634fbc257fd56f0114912c2772aeeb4064f4.meta4").exists());
 #endif // ENABLE_MESSAGE_DIGEST
 
-    std::shared_ptr<RequestGroup> tar =
-      findReservedGroup(e_->getRequestGroupMan(), gid3);
+    auto tar = findReservedGroup(e_->getRequestGroupMan().get(), gid3);
     CPPUNIT_ASSERT(tar);
     CPPUNIT_ASSERT_EQUAL(e_->getOption()->get(PREF_DIR)+"/aria2-5.0.0.tar.bz2",
                          tar->getFirstFilePath());
-    std::shared_ptr<RequestGroup> deb =
-      findReservedGroup(e_->getRequestGroupMan(), gid4);
+    auto deb = findReservedGroup(e_->getRequestGroupMan().get(), gid4);
     CPPUNIT_ASSERT(deb);
     CPPUNIT_ASSERT_EQUAL(e_->getOption()->get(PREF_DIR)+"/aria2-5.0.0.deb",
                          deb->getFirstFilePath());
@@ -436,7 +433,8 @@ void RpcMethodTest::testAddMetalink()
       (0, GroupId::toNumericId
        (gid5, downcast<String>(resParams->get(0))->s().c_str()));
     CPPUNIT_ASSERT_EQUAL(dir+"/aria2-5.0.0.tar.bz2",
-                         findReservedGroup(e_->getRequestGroupMan(), gid5)->
+                         findReservedGroup
+                         (e_->getRequestGroupMan().get(), gid5)->
                          getFirstFilePath());
 #ifdef ENABLE_MESSAGE_DIGEST
     CPPUNIT_ASSERT
@@ -481,7 +479,7 @@ void RpcMethodTest::testAddMetalink_withPosition()
   CPPUNIT_ASSERT_EQUAL(0, res2.code);
 
   CPPUNIT_ASSERT_EQUAL(e_->getOption()->get(PREF_DIR)+"/aria2-5.0.0.tar.bz2",
-                       getReservedGroup(e_->getRequestGroupMan(), 0)->
+                       getReservedGroup(e_->getRequestGroupMan().get(), 0)->
                        getFirstFilePath());
 }
 
@@ -712,7 +710,7 @@ void RpcMethodTest::testTellWaiting()
 #else // !ENABLE_BITTORRENT
   addUri("http://4/", e_);
 #endif // !ENABLE_BITTORRENT
-  const std::shared_ptr<RequestGroupMan>& rgman = e_->getRequestGroupMan();
+  auto& rgman = e_->getRequestGroupMan();
   TellWaitingRpcMethod m;
   RpcRequest req(TellWaitingRpcMethod::getMethodName(), List::g());
   req.params->append(Integer::g(1));
@@ -721,9 +719,11 @@ void RpcMethodTest::testTellWaiting()
   CPPUNIT_ASSERT_EQUAL(0, res.code);
   const List* resParams = downcast<List>(res.param);
   CPPUNIT_ASSERT_EQUAL((size_t)2, resParams->size());
-  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman, 1)->getGID()),
+  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman.get(), 1)
+                                      ->getGID()),
                        getString(downcast<Dict>(resParams->get(0)), "gid"));
-  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman, 2)->getGID()),
+  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman.get(), 2)
+                                      ->getGID()),
                        getString(downcast<Dict>(resParams->get(1)), "gid"));
   // waiting.size() == offset+num
   req = RpcRequest(TellWaitingRpcMethod::getMethodName(), List::g());
@@ -779,9 +779,11 @@ void RpcMethodTest::testTellWaiting()
   CPPUNIT_ASSERT_EQUAL(0, res.code);
   resParams = downcast<List>(res.param);
   CPPUNIT_ASSERT_EQUAL((size_t)2, resParams->size());
-  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman, 3)->getGID()),
+  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman.get(),
+                                                       3)->getGID()),
                        getString(downcast<Dict>(resParams->get(0)), "gid"));
-  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman, 2)->getGID()),
+  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman.get(),
+                                                       2)->getGID()),
                        getString(downcast<Dict>(resParams->get(1)), "gid"));
   // negative offset and size < num
   req.params->set(1, Integer::g(100));
@@ -973,7 +975,7 @@ void RpcMethodTest::testChangePosition()
     (std::shared_ptr<RequestGroup>(new RequestGroup(GroupId::create(),
                                                  util::copy(option_))));
 
-  a2_gid_t gid = getReservedGroup(e_->getRequestGroupMan(), 0)->getGID();
+  a2_gid_t gid = getReservedGroup(e_->getRequestGroupMan().get(), 0)->getGID();
   ChangePositionRpcMethod m;
   RpcRequest req(ChangePositionRpcMethod::getMethodName(), List::g());
   req.params->append(GroupId::toHex(gid));
@@ -983,7 +985,7 @@ void RpcMethodTest::testChangePosition()
   CPPUNIT_ASSERT_EQUAL(0, res.code);
   CPPUNIT_ASSERT_EQUAL((int64_t)1, downcast<Integer>(res.param)->i());
   CPPUNIT_ASSERT_EQUAL
-    (gid, getReservedGroup(e_->getRequestGroupMan(), 1)->getGID());
+    (gid, getReservedGroup(e_->getRequestGroupMan().get(), 1)->getGID());
 }
 
 void RpcMethodTest::testChangePosition_fail()
@@ -1246,10 +1248,12 @@ void RpcMethodTest::testSystemMulticall()
   CPPUNIT_ASSERT_EQUAL(0, res.code);
   const List* resParams = downcast<List>(res.param);
   CPPUNIT_ASSERT_EQUAL((size_t)7, resParams->size());
-  std::shared_ptr<RequestGroupMan> rgman = e_->getRequestGroupMan();
-  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman, 0)->getGID()),
+  auto& rgman = e_->getRequestGroupMan();
+  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman.get(), 0)
+                                      ->getGID()),
                        downcast<String>(downcast<List>(resParams->get(0))->get(0))->s());
-  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman, 1)->getGID()),
+  CPPUNIT_ASSERT_EQUAL(GroupId::toHex(getReservedGroup(rgman.get(), 1)
+                                      ->getGID()),
                        downcast<String>(downcast<List>(resParams->get(1))->get(0))->s());
   CPPUNIT_ASSERT_EQUAL((int64_t)1,
                        downcast<Integer>
diff --git a/test/SessionSerializerTest.cc b/test/SessionSerializerTest.cc
index c67b8156..1019eb2f 100644
--- a/test/SessionSerializerTest.cc
+++ b/test/SessionSerializerTest.cc
@@ -48,9 +48,8 @@ void SessionSerializerTest::testSave()
   CPPUNIT_ASSERT_EQUAL((size_t)5, result.size());
   result[4]->getOption()->put(PREF_PAUSE, A2_V_TRUE);
   option->put(PREF_MAX_DOWNLOAD_RESULT, "10");
-  std::shared_ptr<RequestGroupMan> rgman
-    (new RequestGroupMan(result, 1, option.get()));
-  SessionSerializer s(rgman);
+  RequestGroupMan rgman{result, 1, option.get()};
+  SessionSerializer s(&rgman);
   std::shared_ptr<DownloadResult> drs[] = {
     // REMOVED downloads will not be saved.
     createDownloadResult(error_code::REMOVED, "http://removed"),
@@ -76,13 +75,13 @@ void SessionSerializerTest::testSave()
 
   drs[3]->option->put(PREF_FORCE_SAVE, A2_V_TRUE);
   for(size_t i = 0; i < sizeof(drs)/sizeof(drs[0]); ++i) {
-    rgman->addDownloadResult(drs[i]);
+    rgman.addDownloadResult(drs[i]);
   }
 
   DownloadEngine e(std::shared_ptr<EventPoll>(new SelectEventPoll()));
   e.setOption(option.get());
-  rgman->fillRequestGroupFromReserver(&e);
-  CPPUNIT_ASSERT_EQUAL((size_t)1, rgman->getRequestGroups().size());
+  rgman.fillRequestGroupFromReserver(&e);
+  CPPUNIT_ASSERT_EQUAL((size_t)1, rgman.getRequestGroups().size());
 
   std::string filename = A2_TEST_OUT_DIR"/aria2_SessionSerializerTest_testSave";
   s.save(filename);
@@ -148,11 +147,10 @@ void SessionSerializerTest::testSaveErrorDownload()
     (dr->fileEntries[0]->getRemainingUris());
   std::shared_ptr<Option> option(new Option());
   option->put(PREF_MAX_DOWNLOAD_RESULT, "10");
-  std::shared_ptr<RequestGroupMan> rgman
-    (new RequestGroupMan(std::vector<std::shared_ptr<RequestGroup> >(), 1,
-                         option.get()));
-  rgman->addDownloadResult(dr);
-  SessionSerializer s(rgman);
+  RequestGroupMan rgman{std::vector<std::shared_ptr<RequestGroup> >(), 1,
+                        option.get()};
+  rgman.addDownloadResult(dr);
+  SessionSerializer s(&rgman);
   std::string filename =
     A2_TEST_OUT_DIR"/aria2_SessionSerializerTest_testSaveErrorDownload";
   CPPUNIT_ASSERT(s.save(filename));
diff --git a/test/TestUtil.cc b/test/TestUtil.cc
index da70c5ef..5a7cb5bb 100644
--- a/test/TestUtil.cc
+++ b/test/TestUtil.cc
@@ -104,9 +104,9 @@ WrDiskCacheEntry::DataCell* createDataCell(int64_t goff,
 }
 
 std::shared_ptr<RequestGroup> findReservedGroup
-(const std::shared_ptr<RequestGroupMan>& rgman, a2_gid_t gid)
+(RequestGroupMan* rgman, a2_gid_t gid)
 {
-  std::shared_ptr<RequestGroup> rg = rgman->findGroup(gid);
+  auto rg = rgman->findGroup(gid);
   if(rg) {
     if(rg->getState() == RequestGroup::STATE_WAITING) {
       return rg;
@@ -118,10 +118,10 @@ std::shared_ptr<RequestGroup> findReservedGroup
 }
 
 std::shared_ptr<RequestGroup> getReservedGroup
-(const std::shared_ptr<RequestGroupMan>& rgman, size_t index)
+(RequestGroupMan* rgman, size_t index)
 {
   assert(rgman->getReservedGroups().size() > index);
-  RequestGroupList::const_iterator i = rgman->getReservedGroups().begin();
+  auto i = rgman->getReservedGroups().begin();
   std::advance(i, index);
   return *i;
 }
diff --git a/test/TestUtil.h b/test/TestUtil.h
index a559e6a9..6c126aba 100644
--- a/test/TestUtil.h
+++ b/test/TestUtil.h
@@ -60,10 +60,10 @@ WrDiskCacheEntry::DataCell* createDataCell(int64_t goff,
                                            size_t offset = 0);
 
 std::shared_ptr<RequestGroup> findReservedGroup
-(const std::shared_ptr<RequestGroupMan>& rgman, a2_gid_t gid);
+(RequestGroupMan* rgman, a2_gid_t gid);
 
 std::shared_ptr<RequestGroup> getReservedGroup
-(const std::shared_ptr<RequestGroupMan>& rgman, size_t index);
+(RequestGroupMan* rgman, size_t index);
 
 std::shared_ptr<RequestGroup> createRequestGroup(int32_t pieceLength,
                                               int64_t totalLength,