diff --git a/CMakeLists.txt b/CMakeLists.txt
index 22564da9b..eff883b68 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -177,7 +177,7 @@ elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
     set(COLOR_FLAG "")
   endif()
   # using GCC
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -Wuninitialized -Wunreachable-code -Wstrict-overflow=2 -D_FORTIFY_SOURCE=2 ${COLOR_FLAG} -fPIC")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -Wuninitialized -Wunreachable-code -Wstrict-overflow=1 -D_FORTIFY_SOURCE=2 ${COLOR_FLAG} -fPIC")
   if(WIN32) # using mingw
     add_definitions(-D_USE_MATH_DEFINES) # define M_PI, M_1_PI etc.
     add_definitions(-DWIN32)