diff --git a/test/README.md b/test/README.md
index ce5c76c..34ac908 100644
--- a/test/README.md
+++ b/test/README.md
@@ -72,7 +72,9 @@ cast send $TOKEN_PROXY_ADDRESS "mint(address,uint256)" <TO_ADDRESS> <AMOUNT> --r
 cast send $TOKEN_PROXY_ADDRESS "mintWithETH(address,uint256)" <TO_ACCOUNT> <AMOUNT> --value <ETH_AMOUNT> --rpc-url $RPC_URL --private-key $MINTING_ACCOUNT_PRIVATE_KEY --from $MINTING_ACCOUNT_ADDRESS
 ```
 
-**Note**: The `mintWithETH` function is public and can be called by anyone. It requires sending ETH with the transaction (using `--value`), which gets burned (sent to address(0)) as an economic cost for minting tokens. This provides a permissionless way to obtain tokens for testing without requiring minter privileges.
+**Note**: The `mintWithETH` function is public and can be called by anyone. It requires sending ETH with the transaction
+(using `--value`), which gets burned (sent to address(0)) as an economic cost for minting tokens. This provides a
+permissionless way to obtain tokens for testing without requiring minter privileges.
 
 ### Approve the token for the waku-rlnv2-contract to use
 
diff --git a/test/TestStableToken.sol b/test/TestStableToken.sol
index 4c0be30..7c8f769 100644
--- a/test/TestStableToken.sol
+++ b/test/TestStableToken.sol
@@ -13,7 +13,6 @@ error AccountNotMinter();
 error AccountAlreadyMinter();
 error AccountNotInMinterList();
 error InsufficientETH();
-error ETHTransferFailed();
 
 contract TestStableToken is
     Initializable,
@@ -66,8 +65,7 @@ contract TestStableToken is
         if (msg.value == 0) revert InsufficientETH();
 
         // Burn ETH by sending to zero address
-        (bool success,) = payable(address(0)).call{ value: msg.value }("");
-        if (!success) revert ETHTransferFailed();
+        payable(address(0)).transfer(msg.value);
 
         _mint(to, amount);
 
diff --git a/test/TestStableToken.t.sol b/test/TestStableToken.t.sol
index 0f81719..59d8c5f 100644
--- a/test/TestStableToken.t.sol
+++ b/test/TestStableToken.t.sol
@@ -7,8 +7,7 @@ import {
     AccountNotMinter,
     AccountAlreadyMinter,
     AccountNotInMinterList,
-    InsufficientETH,
-    ETHTransferFailed
+    InsufficientETH
 } from "./TestStableToken.sol";
 import { ERC1967Proxy } from "@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol";
 import { DeployTokenWithProxy } from "../script/DeployTokenWithProxy.s.sol";