diff --git a/src/gui/sdlmain.cpp b/src/gui/sdlmain.cpp
index 536d23b6..f7b2f6b3 100644
--- a/src/gui/sdlmain.cpp
+++ b/src/gui/sdlmain.cpp
@@ -20,6 +20,10 @@
 #include <stdio.h>
 #include <unistd.h>
 
+#ifdef MACOSX
+extern char** environ;
+#endif
+
 #include "SDL.h"
 #include "SDL_thread.h"