diff --git a/src/video/cocoa/SDL_cocoamessagebox.m b/src/video/cocoa/SDL_cocoamessagebox.m
index 802deea62..6dc8a2a14 100644
--- a/src/video/cocoa/SDL_cocoamessagebox.m
+++ b/src/video/cocoa/SDL_cocoamessagebox.m
@@ -26,6 +26,7 @@
 #include <altivec.h>
 #undef bool
 #undef vector
+#undef pixel
 #endif
 
 #include "SDL_messagebox.h"