From 32bc7a6fe52f981eb0f0a6601e14ebcb6372c12c Mon Sep 17 00:00:00 2001
From: "Hao (Alan) Tang" <7888785@qq.com>
Date: Fri, 2 Nov 2018 02:56:50 -0700
Subject: [PATCH] add an address typecast to this per issue #1457 (#1471)

---
 contracts/drafts/TokenVesting.sol | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/contracts/drafts/TokenVesting.sol b/contracts/drafts/TokenVesting.sol
index 2f5fd2fdc..3fa49f79f 100644
--- a/contracts/drafts/TokenVesting.sol
+++ b/contracts/drafts/TokenVesting.sol
@@ -161,7 +161,7 @@ contract TokenVesting is Ownable {
    * @param token ERC20 token which is being vested
    */
   function _vestedAmount(IERC20 token) private view returns (uint256) {
-    uint256 currentBalance = token.balanceOf(this);
+    uint256 currentBalance = token.balanceOf(address(this));
     uint256 totalBalance = currentBalance.add(_released[token]);
 
     if (block.timestamp < _cliff) {