diff --git a/lesson-3/chapter-8/zombiehelper.sol b/lesson-3/chapter-8/zombiehelper.sol
index f9c55e6..e2b6a02 100644
--- a/lesson-3/chapter-8/zombiehelper.sol
+++ b/lesson-3/chapter-8/zombiehelper.sol
@@ -2,7 +2,7 @@ pragma solidity ^0.4.25;
 import "./zombiefeeding.sol";
 contract ZombieHelper is ZombieFeeding {
 
-  modifier aboveLevel(uint _level, uint _zombieId) {
+  modifier aboveLevel(uint32 _level, uint _zombieId) {
     require(zombies[_zombieId].level >= _level);
     _;
   }