diff --git a/CMakeLists.txt b/CMakeLists.txt
index baa399de7..fe436d351 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -522,7 +522,7 @@ if(UNIX)
             HAVE_MALLOC_H)
 
     check_cxx_source_compiles("#include <malloc.h>
-    int main() { malloc_usable_size(NULL, 0); return 0; }"
+    int main() { malloc_usable_size(NULL); return 0; }"
             HAVE_MALLOC_USABLE_SIZE)
 
     check_cxx_source_compiles("#include <sys/resource.h>