diff --git a/contracts/erc20/contracts/src/WETH9.sol b/contracts/erc20/contracts/src/WETH9.sol
index c9b04bb1e8..4881ef6547 100644
--- a/contracts/erc20/contracts/src/WETH9.sol
+++ b/contracts/erc20/contracts/src/WETH9.sol
@@ -38,7 +38,7 @@ contract WETH9 {
         emit Deposit(msg.sender, msg.value);
     }
     function withdraw(uint wad) public {
-        require(balanceOf[msg.sender] >= wad, "WETH9/INSUFFICIENT_BALANCE");
+        require(balanceOf[msg.sender] >= wad);
         balanceOf[msg.sender] -= wad;
         msg.sender.transfer(wad);
         emit Withdrawal(msg.sender, wad);
@@ -62,10 +62,10 @@ contract WETH9 {
         public
         returns (bool)
     {
-        require(balanceOf[src] >= wad), "WETH9/INSUFFICIENT_BALANCE";
+        require(balanceOf[src] >= wad);
 
         if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
-            require(allowance[src][msg.sender] >= wad, "WETH9/INSUFFICIENT_ALLOWANCE");
+            require(allowance[src][msg.sender] >= wad);
             allowance[src][msg.sender] -= wad;
         }