diff --git a/game.cpp b/game.cpp
index 2868be09..7367fc9c 100644
--- a/game.cpp
+++ b/game.cpp
@@ -3106,6 +3106,8 @@ bool makeEmpty(cell *c) {
     ;
   else if(c->wall == waOpenPlate && bounded)
     ;
+  else if(c->wall == waTrunk || c->wall == waSolidBranch || c->wall == waWeakBranch)
+    ;
   else if(c->wall == waGiantRug)
     ;
   else if(c->wall == waDock)