diff --git a/contracts/metatx/Forwarder.sol b/contracts/metatx/Forwarder.sol
index 6800a5da75b..0d6a1649840 100644
--- a/contracts/metatx/Forwarder.sol
+++ b/contracts/metatx/Forwarder.sol
@@ -16,8 +16,8 @@ contract Forwarder is IForwarder {
     bytes32 private constant _EIP721DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
 
     mapping(address => Counters.Counter) private _nonces;
-    mapping(bytes32 => bool) public _typeHashes;
-    mapping(bytes32 => bool) public _domains;
+    mapping(bytes32 => bool) private _typeHashes;
+    mapping(bytes32 => bool) private _domains;
 
     event RequestTypeRegistered(bytes32 indexed typeHash, string typeStr);
     event DomainRegistered(bytes32 indexed domainSeparator, bytes domainValue);