diff --git a/CMakeLists.txt b/CMakeLists.txt
index dfd1aee3f..a7f1c98c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -945,7 +945,7 @@ if(ENABLE_GPERFTOOLS)
     endif(GPERFTOOLS_FOUND)
 endif(ENABLE_GPERFTOOLS)
 
-list(APPEND CMAKE_CXX_FLAGS ${MY_CXX_FLAGS})
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${MY_CXX_FLAGS}")
 
 if(OS_IS_LINUX)      
     if(${LINUX_DISTRIBUTION} MATCHES "Fedora" OR ${LINUX_DISTRIBUTION} MATCHES "openSUSE")