diff --git a/test/e2e/json-rpc/eth_call.spec.ts b/test/e2e/json-rpc/eth_call.spec.ts
index 0cb71e89e2a3..df94d1ce4ead 100644
--- a/test/e2e/json-rpc/eth_call.spec.ts
+++ b/test/e2e/json-rpc/eth_call.spec.ts
@@ -35,9 +35,9 @@ describe('eth_call', function () {
 
         // eth_call
         await driver.openNewPage(`http://127.0.0.1:8080`);
-        const balanceOf = `0x${keccak256(
-          Buffer.from('balanceOf(address)'),
-        ).toString()}`;
+        const balanceOf = `0x${Buffer.from(
+          keccak256(Buffer.from('balanceOf(address)')),
+        ).toString('hex')}`;
         const walletAddress = '0x5cfe73b6021e818b776b421b1c4db2474086a7e1';
         const request = JSON.stringify({
           jsonrpc: '2.0',
diff --git a/ui/pages/confirmations/components/transaction-alerts/transaction-alerts.stories.js b/ui/pages/confirmations/components/transaction-alerts/transaction-alerts.stories.js
index c6e286e1b948..c8fd3d6e81bb 100644
--- a/ui/pages/confirmations/components/transaction-alerts/transaction-alerts.stories.js
+++ b/ui/pages/confirmations/components/transaction-alerts/transaction-alerts.stories.js
@@ -42,7 +42,7 @@ const customTransaction = ({
   };
   // just simulate hash if not provided
   if (!props?.hash) {
-    tx.hash = `0x${keccak256(Buffer.from(JSON.stringify(tx))).toString('hex')}`;
+    tx.hash = `0x${Buffer.from(keccak256(Buffer.from(JSON.stringify(tx)))).toString('hex')}`;
   }
   return tx;
 };