diff --git a/dat/mines.des b/dat/mines.des
index fce71d2ec..e30568a62 100644
--- a/dat/mines.des
+++ b/dat/mines.des
@@ -180,6 +180,8 @@ LOOP [9 + 2d5] {
     }
 }
 
+# Hack to force full-level wallification
+NOMAP
 WALLIFY