diff --git a/cmake/modules/CMakeFunctions.cmake b/cmake/modules/CMakeFunctions.cmake
index c15afee5..24b38c9c 100644
--- a/cmake/modules/CMakeFunctions.cmake
+++ b/cmake/modules/CMakeFunctions.cmake
@@ -15,7 +15,6 @@ macro(use_rtti val)
             llvm_replace_compiler_option(CMAKE_CXX_FLAGS "-frtti" "-fno-rtti" )
         endif()
     endif()
-    set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" PARENT_SCOPE )
 endmacro(use_rtti)
 
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