diff --git a/contracts/pools/erc20.sol b/contracts/pools/erc20.sol
index e5f71da..00c7e3c 100644
--- a/contracts/pools/erc20.sol
+++ b/contracts/pools/erc20.sol
@@ -169,11 +169,10 @@ contract PoolToken is ReentrancyGuard, DSMath, ERC20Pausable {
       uint _bal = balanceOf(msg.sender);
       uint _tknBal = wdiv(_bal, exchangeRate);
       uint _burnAmt;
-      if (tknAmt == uint(-1)) {
+      if (tknAmt >= _tknBal) {
         _burnAmt = _bal;
         _tknAmt = _tknBal;
       } else {
-        require(tknAmt <= _tknBal, "balance-exceeded");
         _burnAmt = wmul(tknAmt, exchangeRate);
         _tknAmt = tknAmt;
       }
diff --git a/contracts/pools/eth.sol b/contracts/pools/eth.sol
index d6a8932..b184ccf 100644
--- a/contracts/pools/eth.sol
+++ b/contracts/pools/eth.sol
@@ -165,11 +165,10 @@ contract PoolToken is ReentrancyGuard, ERC20Pausable, DSMath {
     uint _bal = balanceOf(msg.sender);
     uint _tknBal = wdiv(_bal, exchangeRate);
     uint _burnAmt;
-    if (tknAmt == uint(-1)) {
+    if (tknAmt >= _tknBal) {
       _burnAmt = _bal;
       _tknAmt = _tknBal;
     } else {
-      require(tknAmt <= _tknBal, "balance-exceeded");
       _burnAmt = wmul(tknAmt, exchangeRate);
       _tknAmt = tknAmt;
     }