diff --git a/core/typedefs.h b/core/typedefs.h
index 24c247fd388..9fa5ba320c0 100644
--- a/core/typedefs.h
+++ b/core/typedefs.h
@@ -92,6 +92,7 @@
 #undef Error
 #undef OK
 #undef CONNECT_DEFERRED // override from Windows SDK, clashes with Object enum
+#undef MONO_FONT
 #endif
 
 // Make room for our constexpr's below by overriding potential system-specific macros.