diff --git a/kde-modules/KDEFrameworkCompilerSettings.cmake b/kde-modules/KDEFrameworkCompilerSettings.cmake
--- a/kde-modules/KDEFrameworkCompilerSettings.cmake
+++ b/kde-modules/KDEFrameworkCompilerSettings.cmake
@@ -71,7 +71,8 @@
    endif()
 endif()
 
-if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+# don't enable with apple clang
+if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
    if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "5.0.0")
       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wzero-as-null-pointer-constant" )
    endif()