diff --git a/packages/extension/src/background/RequestBytesSign.ts b/packages/extension/src/background/RequestBytesSign.ts
index eb76606aea..203dbcbd02 100644
--- a/packages/extension/src/background/RequestBytesSign.ts
+++ b/packages/extension/src/background/RequestBytesSign.ts
@@ -5,6 +5,7 @@
 import { KeyringPair } from '@polkadot/keyring/types';
 import { RequestSign } from './types';
 import { SignerPayloadJSON, SignerPayloadRaw } from '@polkadot/types/types';
+import { u8aToHex } from '@polkadot/util';
 
 export default class RequestBytesSign implements RequestSign {
   inner: SignerPayloadJSON | SignerPayloadRaw;
@@ -16,6 +17,6 @@ export default class RequestBytesSign implements RequestSign {
   sign (pair: KeyringPair): { signature: string } {
     const inner = this.inner as SignerPayloadRaw;
     const signedBytes = pair.sign(new TextEncoder().encode(inner.data));
-    return { signature: new TextDecoder().decode(signedBytes) };
+    return { signature: u8aToHex(signedBytes) };
   }
 }