diff --git a/libvo/x11_common.c b/libvo/x11_common.c
index 0fd9bc92e9..c12d05dc8b 100644
--- a/libvo/x11_common.c
+++ b/libvo/x11_common.c
@@ -1376,6 +1376,7 @@ void vo_vm_close(Display *dpy)
            XF86VidModeSwitchToMode(dpy,screen,vidmodes[i]);
            XF86VidModeSwitchToMode(dpy,screen,vidmodes[i]);
            free(vidmodes);
+           vidmodes = NULL;
          }
 }
 #endif