add feature request #3084

OpenZeppelin · Jan 6, 2022 · 6de0be4 · 6de0be4
1 parent d746056
commit 6de0be4
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/contracts/token/ERC20/ERC20.sol b/contracts/token/ERC20/ERC20.sol
@@ -153,9 +153,11 @@ contract ERC20 is Context, IERC20, IERC20Metadata {
         uint256 amount
     ) public virtual override returns (bool) {
         uint256 currentAllowance = _allowances[sender][_msgSender()];
-        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
-        unchecked {
-            _approve(sender, _msgSender(), currentAllowance - amount);
+        if (currentAllowance != 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) {
+            require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
+            unchecked {
+                _approve(sender, _msgSender(), currentAllowance - amount);
+            }
         }
 
         _transfer(sender, recipient, amount);