diff --git a/src/ledger-keyring.test.ts b/src/ledger-keyring.test.ts
index f457001f..5c0ca773 100644
--- a/src/ledger-keyring.test.ts
+++ b/src/ledger-keyring.test.ts
@@ -545,7 +545,9 @@ describe('LedgerKeyring', function () {
           .mockImplementation(async (params) => {
             expect(params).toStrictEqual({
               hdPath: "m/44'/60'/0'/0",
-              tx: RLP.encode(newFakeTx.getMessageToSign(false)).toString(),
+              tx: Buffer.from(
+                RLP.encode(newFakeTx.getMessageToSign(false)),
+              ).toString('hex'),
             });
             return expectedRSV;
           });
diff --git a/src/ledger-keyring.ts b/src/ledger-keyring.ts
index 77392c5b..08bd6103 100644
--- a/src/ledger-keyring.ts
+++ b/src/ledger-keyring.ts
@@ -340,7 +340,7 @@ export class LedgerKeyring extends EventEmitter {
 
     rawTxHex = Buffer.isBuffer(messageToSign)
       ? messageToSign.toString('hex')
-      : RLP.encode(messageToSign).toString();
+      : Buffer.from(RLP.encode(messageToSign)).toString('hex');
 
     return this.#signTransaction(address, rawTxHex, (payload) => {
       // Because tx will be immutable, first get a plain javascript object that