diff --git a/panda/src/glstuff/glstuff_src.h b/panda/src/glstuff/glstuff_src.h
index 458db2feae..c7d85d85e6 100644
--- a/panda/src/glstuff/glstuff_src.h
+++ b/panda/src/glstuff/glstuff_src.h
@@ -39,7 +39,6 @@
 
 // This forces the stuff in panda_glext.h to be reloaded,
 // if it was already loaded.
-
 #if defined(GL_GLEXT_VERSION) && GL_GLEXT_VERSION < 29
   #undef GL_GLEXT_VERSION
   #undef GL_GLEXT_PROTOTYPES
@@ -51,6 +50,11 @@
 #endif
 #endif
 
+#ifdef IS_OSX
+  #undef GL_GLEXT_VERSION
+  #undef GL_GLEXT_PROTOTYPES
+#endif
+
 #include "panda_glext.h"
 
 #include "glmisc_src.h"