diff --git a/Dockerfile b/Dockerfile
index 82dd35b..8f3bc69 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ RUN apk add --no-cache upx ||:
 RUN curl https://download.libsodium.org/libsodium/releases/LATEST.tar.gz | tar xzvf - && cd libsodium-stable && env CFLAGS="-Os" CPPFLAGS="-DED25519_NONDETERMINISTIC=1" ./configure --disable-dependency-tracking && make -j$(nproc) check && make install && cd .. && rm -fr libsodium-stable
 
 COPY ./ ./
-RUN mkdir build && cd build && cmake -D BUILD_STATIC_EXECUTABLES=1 .. && make -j$(nproc)
+RUN mkdir build && cd build && cmake -DCMAKE_BUILD_TYPE=MinSizeRel -DBUILD_STATIC_EXECUTABLES=1 .. && make -j$(nproc)
 RUN upx --lzma build/minisign ||:
 
 FROM scratch