diff --git a/CMakeLists.txt b/CMakeLists.txt
index b30b0d68..8b4058f0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,9 +28,9 @@ enable_testing()
 
 message(STATUS "Using ${CMAKE_CXX_COMPILER} (compiler id: ${CMAKE_CXX_COMPILER_ID})")
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-	set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++")
+	set(CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++ ${CMAKE_CXX_FLAGS}")
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-	set(CMAKE_CXX_FLAGS "-std=c++11")
+	set(CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}")
 endif ()
 
 include_directories("${PROJECT_SOURCE_DIR}/include")