diff --git a/src/video/gem/SDL_gemvideo.c b/src/video/gem/SDL_gemvideo.c
index 1b829c5a7..e4176e85a 100644
--- a/src/video/gem/SDL_gemvideo.c
+++ b/src/video/gem/SDL_gemvideo.c
@@ -479,6 +479,8 @@ GEM_VideoInit(_THIS, SDL_PixelFormat * vformat)
     SDL_AtariGL_InitPointers(this);
 #endif
 
+    this->info.wm_available = 1;
+
     /* We're done! */
     return (0);
 }