diff --git a/src/video/sdl_v.h b/src/video/sdl_v.h
--- a/src/video/sdl_v.h
+++ b/src/video/sdl_v.h
@@ -17,7 +17,7 @@ public:
 
 	/* virtual */ bool ChangeResolution(int w, int h);
 
-	/* virtual */ void ToggleFullscreen(bool fullscreen);
+	/* virtual */ bool ToggleFullscreen(bool fullscreen);
 };
 
 class FVideoDriver_SDL: public VideoDriverFactory<FVideoDriver_SDL> {