diff --git a/packages/types/src/extrinsic/util.ts b/packages/types/src/extrinsic/util.ts
index 8b2f0663607..0424b90cfa7 100644
--- a/packages/types/src/extrinsic/util.ts
+++ b/packages/types/src/extrinsic/util.ts
@@ -5,10 +5,12 @@ import type { SignOptions } from '@polkadot/keyring/types';
 import type { Registry } from '@polkadot/types-codec/types';
 import type { IKeyringPair } from '../types/index.js';
 
+import { blake2AsU8a } from '@polkadot/util-crypto';
+
 // a helper function for both types of payloads, Raw and metadata-known
-export function sign (registry: Registry, signerPair: IKeyringPair, u8a: Uint8Array, options?: SignOptions): Uint8Array {
+export function sign (_registry: Registry, signerPair: IKeyringPair, u8a: Uint8Array, options?: SignOptions): Uint8Array {
   const encoded = u8a.length > 256
-    ? registry.hash(u8a)
+    ? blake2AsU8a(u8a)
     : u8a;
 
   return signerPair.sign(encoded, options);