diff --git a/contracts/extending-old/ForkModule.sol b/contracts/extending-old/ForkModule.sol
index 3c9f807..b45d20c 100644
--- a/contracts/extending-old/ForkModule.sol
+++ b/contracts/extending-old/ForkModule.sol
@@ -11,6 +11,7 @@ pragma solidity 0.8.20;
 import {CappedMath} from "../libraries/CappedMath.sol";
 import {IForkModule} from "../interfaces/IForkModule.sol";
 import {IProofOfHumanityOld} from "../interfaces/IProofOfHumanityOld.sol";
+import {IProofOfHumanity} from "../interfaces/IProofOfHumanity.sol";
 
 /** @title ForkModule
  *
@@ -37,7 +38,7 @@ contract ForkModule is IForkModule {
     IProofOfHumanityOld public proofOfHumanityV1;
 
     /// @dev Address of PoH v2 contract instance.
-    address public proofOfHumanityV2;
+    IProofOfHumanity public proofOfHumanityV2;
 
     /// @dev The submissionDuration fetched from PoH v1 at the initialization of this contract.
     uint40 public submissionDuration;
@@ -57,7 +58,7 @@ contract ForkModule is IForkModule {
     }
 
     modifier onlyV2() {
-        require(msg.sender == proofOfHumanityV2, "!poh");
+        require(msg.sender == address(proofOfHumanityV2), "!poh");
         _;
     }
 
@@ -69,7 +70,7 @@ contract ForkModule is IForkModule {
      */
     function initialize(address _proofOfHumanityV1, address _proofOfHumanityV2) public initializer {
         proofOfHumanityV1 = IProofOfHumanityOld(_proofOfHumanityV1);
-        proofOfHumanityV2 = _proofOfHumanityV2;
+        proofOfHumanityV2 = IProofOfHumanity(_proofOfHumanityV2);
 
         forkTime = uint40(block.timestamp);