diff --git a/src/restore.c b/src/restore.c
index b11c31793..2b5a8fccb 100644
--- a/src/restore.c
+++ b/src/restore.c
@@ -1057,8 +1057,10 @@ getlev(NHFILE *nhfp, int pid, xint8 lev)
         Mread(nhfp->fd, &gu.updest, sizeof gu.updest);
         Mread(nhfp->fd, &gd.dndest, sizeof gd.dndest);
         Mread(nhfp->fd, &gl.level.flags, sizeof gl.level.flags);
-        if (gd.doors)
+        if (gd.doors) {
             free(gd.doors);
+            gd.doors = 0;
+        }
         Mread(nhfp->fd, &gd.doors_alloc, sizeof gd.doors_alloc);
         if (gd.doors_alloc) { /* avoid pointless alloc(0) */
             gd.doors = (coord *) alloc(gd.doors_alloc * sizeof (coord));