diff --git a/contracts/proxy/utils/Initializable.sol b/contracts/proxy/utils/Initializable.sol
index 791728309..cc6d9c962 100644
--- a/contracts/proxy/utils/Initializable.sol
+++ b/contracts/proxy/utils/Initializable.sol
@@ -73,8 +73,8 @@ abstract contract Initializable {
         bool _initializing;
     }
 
-    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1))
-    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a0e;
+    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
+    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;
 
     /**
      * @dev The contract is already initialized.