diff --git a/src/video/cocoa/SDL_cocoamessagebox.m b/src/video/cocoa/SDL_cocoamessagebox.m
index c32beb19b..802deea62 100644
--- a/src/video/cocoa/SDL_cocoamessagebox.m
+++ b/src/video/cocoa/SDL_cocoamessagebox.m
@@ -22,6 +22,12 @@
 
 #if SDL_VIDEO_DRIVER_COCOA
 
+#if defined(__APPLE__) && defined(__POWERPC__)
+#include <altivec.h>
+#undef bool
+#undef vector
+#endif
+
 #include "SDL_messagebox.h"
 #include "SDL_cocoavideo.h"