diff --git a/include/SDL_config_macosx.h b/include/SDL_config_macosx.h
index 15b0025cd..481c22edc 100644
--- a/include/SDL_config_macosx.h
+++ b/include/SDL_config_macosx.h
@@ -117,7 +117,7 @@
 
 /* Enable various video drivers */
 #define SDL_VIDEO_DRIVER_DUMMY	1
-#if TARGET_API_MAC_CARBON
+#if ((defined TARGET_API_MAC_CARBON) && (TARGET_API_MAC_CARBON))
 #define SDL_VIDEO_DRIVER_TOOLBOX	1
 #else
 #define SDL_VIDEO_DRIVER_QUARTZ	1