diff --git a/src/scripts/eressea/tunnels.lua b/src/scripts/eressea/tunnels.lua
index d7cfe7752..f0b1771ed 100644
--- a/src/scripts/eressea/tunnels.lua
+++ b/src/scripts/eressea/tunnels.lua
@@ -47,4 +47,5 @@ function tunnel_action(b, param)
       end
     end
   end
+  return 1 -- return 0 to destroy
 end