diff --git a/polymer/eduke32/build/include/mutex.h b/polymer/eduke32/build/include/mutex.h
index 987a141bd..9ef53dfab 100644
--- a/polymer/eduke32/build/include/mutex.h
+++ b/polymer/eduke32/build/include/mutex.h
@@ -7,6 +7,7 @@
 # include <windows.h>
 # include <process.h>
 #else
+# define SDL_MAIN_HANDLED
 # include "sdl_inc.h"
 #endif