diff --git a/contracts/services/ServiceRegistry.sol b/contracts/services/ServiceRegistry.sol
index 0cc541f..9bba7c9 100644
--- a/contracts/services/ServiceRegistry.sol
+++ b/contracts/services/ServiceRegistry.sol
@@ -193,7 +193,7 @@ contract Deposit {
     /// @notice Withdraws the tokens that have been deposited
     /// Only `withdrawer` can call this.
     /// @param _to The address where the withdrawn tokens should go
-    function withdraw(address payable _to) external {
+    function withdraw(address to) external {
         uint256 balance = token.balanceOf(address(this));
         require(msg.sender == withdrawer, "the caller is not the withdrawer");
         require(now >= release_at || service_registry.deprecated(), "deposit not released yet");
diff --git a/contracts/test/HumanStandardToken.sol b/contracts/test/HumanStandardToken.sol
index 8fe0771..e28a8c2 100644
--- a/contracts/test/HumanStandardToken.sol
+++ b/contracts/test/HumanStandardToken.sol
@@ -65,7 +65,6 @@ contract HumanStandardToken is StandardToken {
         return true;
     }
 
-    fallback () external { revert(); }
 
     function decimals() public override view returns (uint8 decimals) {
         return _decimals;