diff -up xgalaga-2.0.34/libsprite/makewindow.c.fs xgalaga-2.0.34/libsprite/makewindow.c
--- xgalaga-2.0.34/libsprite/makewindow.c.fs	2007-08-31 19:32:40.000000000 +0200
+++ xgalaga-2.0.34/libsprite/makewindow.c	2007-08-31 19:41:36.000000000 +0200
@@ -536,7 +536,7 @@ void W_ToggleFullscreen(_win)
 {
 #ifdef XF86VIDMODE      
   int i;
-  XF86VidModeModeLine mode;
+  XF86VidModeModeLine mode = { .hdisplay = 0, .privsize = 0 };
   XF86VidModeModeInfo **modes;
   int mode_count;
 #endif
@@ -609,8 +609,6 @@ void W_ToggleFullscreen(_win)
       fs_width  = mode.hdisplay;
       fs_height = mode.vdisplay;
     }
-    else   /* If we can't get the currentmode force setting of a new mode. */
-      mode.hdisplay = 0;
       
     /* Get list of modelines.  */
     if (!XF86VidModeGetAllModeLines(W_Display, W_Screen, &mode_count, &modes))
@@ -645,7 +643,8 @@ void W_ToggleFullscreen(_win)
     }
         
     /* Switch video mode.  */
-    if (((modes[i]->hdisplay != mode.hdisplay) ||
+    if ((i >= 0) &&
+        ((modes[i]->hdisplay != mode.hdisplay) ||
          (modes[i]->vdisplay != mode.vdisplay)) &&
         XF86VidModeSwitchToMode(W_Display, W_Screen, modes[i]))
     {
@@ -658,6 +657,18 @@ void W_ToggleFullscreen(_win)
            
     /* Set viewport. */
     XF86VidModeSetViewPort(W_Display, W_Screen, 0, 0);
+
+    /* clean up */
+    if (mode.privsize)
+      XFree(mode.private);
+
+    if (mode_count)
+    {
+      for (i = 0; i < mode_count; i++)
+        if (modes[i]->privsize)
+          XFree(modes[i]->private);
+      XFree(modes);
+    }
 #endif
     
     /* Center the window (if nescesarry) */