diff --git a/include/SDL_config_macosx.h b/include/SDL_config_macosx.h
index a134a810b..dd5956c4e 100644
--- a/include/SDL_config_macosx.h
+++ b/include/SDL_config_macosx.h
@@ -144,7 +144,7 @@
 #define SDL_VIDEO_DRIVER_X11_XSCRNSAVER 1
 #define SDL_VIDEO_DRIVER_X11_XSHAPE 1
 #define SDL_VIDEO_DRIVER_X11_XVIDMODE 1
-#define SDL_VIDEO_DRIVER_X11_SUPPORTS_GENERIC_EVENTS
+#define SDL_VIDEO_DRIVER_X11_SUPPORTS_GENERIC_EVENTS 1
 
 #ifndef SDL_VIDEO_RENDER_OGL
 #define SDL_VIDEO_RENDER_OGL	1