diff --git a/CMakeLists.txt b/CMakeLists.txt
index e2eeaed64..4c0ef947c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3271,7 +3271,7 @@ endif()
 if(APPLE)
   foreach(SOURCE_FILE ${SOURCE_FILES})
     get_filename_component(FILE_EXTENSION ${SOURCE_FILE} EXT)
-    if(FILE_EXTENSION STREQUAL "m")
+    if(FILE_EXTENSION STREQUAL ".m")
       set_property(SOURCE ${SOURCE_FILE} APPEND_STRING PROPERTY COMPILE_FLAGS " -x objective-c")
     endif()
   endforeach()