diff --git a/mods/nograssgrow.js b/mods/nograssgrow.js
index 4670082f..cc0910a4 100644
--- a/mods/nograssgrow.js
+++ b/mods/nograssgrow.js
@@ -1,4 +1,4 @@
-elements.grass.tick = null;
+delete elements.grass.tick;
 elements.grass.behavior = [
   ["XX", "XX", "XX"],
   ["XX", "XX", "XX"],