diff --git a/libvo/vo_sdl.c b/libvo/vo_sdl.c
index cbb5cf3368..f57e8e276a 100644
--- a/libvo/vo_sdl.c
+++ b/libvo/vo_sdl.c
@@ -1327,7 +1327,7 @@ static uint32_t control(uint32_t request, void *data, ...)
       set_fullmode(priv->fullmode);
       if(verbose > 1) printf("SDL: Set fullscreen mode\n");
     }
-    //return VO_TRUE; // XXX what should VOCTRL_FULLSCREEN return?
+    return VO_TRUE;
   }
 
   return VO_NOTIMPL;
diff --git a/libvo/vo_x11.c b/libvo/vo_x11.c
index 1d9ed03a00..0d851144b9 100644
--- a/libvo/vo_x11.c
+++ b/libvo/vo_x11.c
@@ -650,6 +650,7 @@ static uint32_t control(uint32_t request, void *data, ...)
 	vo_fs_oldheight = -1;
 	XSync(mDisplay, False);
     }
+    return VO_TRUE;
   }
   return VO_NOTIMPL;
 }