diff --git a/assets/scripts/nethack/dungeon.js b/assets/scripts/nethack/dungeon.js
index f11131b..6882d8b 100644
--- a/assets/scripts/nethack/dungeon.js
+++ b/assets/scripts/nethack/dungeon.js
@@ -319,6 +319,11 @@ class BSPNode {
   }
 }
 
+function randomInt(n) {
+  max = Math.floor(n);
+  return Math.floor(Math.random() * max);
+}
+
 let grid;
 
 new p5(p => {