diff --git a/cmake/macros.cmake b/cmake/macros.cmake
index c234a566c..96a7ce8b1 100644
--- a/cmake/macros.cmake
+++ b/cmake/macros.cmake
@@ -66,7 +66,7 @@ endmacro()
 
 macro(CHECK_OBJC_SOURCE_COMPILES SOURCE VAR)
   set(PREV_REQUIRED_DEFS "${CMAKE_REQUIRED_DEFINITIONS}")
-  set(CMAKE_REQUIRED_DEFINITIONS "-ObjC ${PREV_REQUIRED_DEFS}")
+  set(CMAKE_REQUIRED_DEFINITIONS "-x objective-c ${PREV_REQUIRED_DEFS}")
   CHECK_C_SOURCE_COMPILES(${SOURCE} ${VAR})
   set(CMAKE_REQUIRED_DEFINITIONS "${PREV_REQUIRED_DEFS}")
 endmacro()