diff --git a/contracts/mocks/BurnableTokenMock.sol b/contracts/mocks/BurnableTokenMock.sol
index 8b2b619f8..f7bdd59d9 100644
--- a/contracts/mocks/BurnableTokenMock.sol
+++ b/contracts/mocks/BurnableTokenMock.sol
@@ -5,7 +5,7 @@ import "../token/ERC20/BurnableToken.sol";
 
 contract BurnableTokenMock is BurnableToken {
 
-  constructor(address _initialAccount, uint _initialBalance) public {
+  constructor(address _initialAccount, uint256 _initialBalance) public {
     balances[_initialAccount] = _initialBalance;
     totalSupply_ = _initialBalance;
   }