diff --git a/CMakeLists.txt b/CMakeLists.txt
index 28bbc6de..1e1a1d4e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -94,7 +94,7 @@ endif()
 
 
 add_definitions(-D_CRT_SECURE_NO_WARNINGS)
-add_definitions(-std=c++11)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 
 file(GLOB SOURCE *.cpp )