diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8ba63c7065..df64c6e944 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -191,7 +191,7 @@ endif()
 if(APPLE)
     add_compile_options(-Wsign-compare)
     add_definitions(-DDarwin)
-    add_definitions(-Wno-deprecated-register)
+    add_compile_options(-Wno-deprecated-register)
 elseif(CYGWIN)
     add_definitions(-DWIN32)
     if(AERON_TESTS)