diff --git a/test/MiniMeToken.t.sol b/test/MiniMeToken.t.sol
index 88392d4..770031b 100644
--- a/test/MiniMeToken.t.sol
+++ b/test/MiniMeToken.t.sol
@@ -1410,6 +1410,6 @@ contract SigUtils {
 
     // computes the hash of the fully encoded EIP-712 message for the domain, which can be used to recover the signer
     function getTypedDataHash(Permit memory _permit) public view returns (bytes32) {
-        return keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, getStructHash(_permit)));
+        return ECDSA.toTypedDataHash(DOMAIN_SEPARATOR, getStructHash(_permit));
     }
 }