diff --git a/src/os/macosx/osx_stdafx.h b/src/os/macosx/osx_stdafx.h
index 688762be9c..0017dc1c69 100644
--- a/src/os/macosx/osx_stdafx.h
+++ b/src/os/macosx/osx_stdafx.h
@@ -44,6 +44,7 @@
 #define WindowClass OTTDWindowClass
 #define ScriptOrder OTTDScriptOrder
 #define Palette     OTTDPalette
+#define GlyphID     OTTDGlyphID
 
 #include <CoreServices/CoreServices.h>
 #include <ApplicationServices/ApplicationServices.h>
@@ -53,6 +54,7 @@
 #undef WindowClass
 #undef ScriptOrder
 #undef Palette
+#undef GlyphID
 
 /* remove the variables that CoreServices defines, but we define ourselves too */
 #undef bool