diff --git a/circuits/withdraw.circom b/circuits/withdraw.circom
index 0599a89..27612d8 100644
--- a/circuits/withdraw.circom
+++ b/circuits/withdraw.circom
@@ -33,7 +33,6 @@ template Withdraw(levels, rounds) {
     signal input receiver; // not taking part in any computations
     signal input relayer; // not taking part in any computations
     signal input fee; // not taking part in any computations
-
     signal private input nullifier;
     signal private input secret;
     signal private input pathElements[levels];
diff --git a/contracts/ETHMixer.sol b/contracts/ETHMixer.sol
index 0c0741d..107fe6c 100644
--- a/contracts/ETHMixer.sol
+++ b/contracts/ETHMixer.sol
@@ -12,10 +12,8 @@
 pragma solidity ^0.5.8;
 
 import "./Mixer.sol";
-import "@openzeppelin/contracts-ethereum-package/contracts/GSN/GSNRecipient.sol";
-import "@openzeppelin/contracts-ethereum-package/contracts/GSN/IRelayHub.sol";
 
-contract ETHMixer is Mixer, GSNRecipient {
+contract ETHMixer is Mixer {
   constructor(
     address _verifier,
     uint256 _mixDenomination,
diff --git a/contracts/Mixer.sol b/contracts/Mixer.sol
index 96a3684..0f2017f 100644
--- a/contracts/Mixer.sol
+++ b/contracts/Mixer.sol
@@ -29,7 +29,7 @@ contract Mixer is MerkleTreeWithHistory {
   uint256 public mixDenomination;
 
   event Deposit(uint256 indexed commitment, uint256 leafIndex, uint256 timestamp);
-  event Withdraw(address to, uint256 nullifierHash, address indexed relayer, uint fee);
+  event Withdraw(address to, uint256 nullifierHash, address indexed relayer, uint256 fee);
 
   /**
     @dev The constructor