diff --git a/src/wallet.test.ts b/src/wallet.test.ts
index 7c69f872..a81b5865 100644
--- a/src/wallet.test.ts
+++ b/src/wallet.test.ts
@@ -116,6 +116,26 @@ describe('wallet', () => {
         'The requested account and/or method has not been authorized by the user.',
       );
     });
+
+    it('should not override other request params', async () => {
+      const { engine } = createTestSetup();
+      const getAccounts = async () => testAddresses.slice(0, 2);
+      const witnessedTxParams: TransactionParams[] = [];
+      const processTransaction = async (_txParams: TransactionParams) => {
+        witnessedTxParams.push(_txParams);
+        return testTxHash;
+      };
+      engine.push(createWalletMiddleware({ getAccounts, processTransaction }));
+      const txParams = {
+        from: testAddresses[0],
+        to: testAddresses[1],
+      };
+
+      const payload = { method: 'eth_sendTransaction', params: [txParams] };
+      await pify(engine.handle).call(engine, payload);
+      expect(witnessedTxParams).toHaveLength(1);
+      expect(witnessedTxParams[0]).toStrictEqual(txParams);
+    });
   });
 
   describe('signTransaction', () => {
@@ -144,6 +164,29 @@ describe('wallet', () => {
       expect(witnessedTxParams[0]).toStrictEqual(txParams);
     });
 
+    it('should not override other request params', async () => {
+      const { engine } = createTestSetup();
+      const getAccounts = async () => testAddresses.slice(0, 2);
+      const witnessedTxParams: TransactionParams[] = [];
+      const processSignTransaction = async (_txParams: TransactionParams) => {
+        witnessedTxParams.push(_txParams);
+        return testTxHash;
+      };
+
+      engine.push(
+        createWalletMiddleware({ getAccounts, processSignTransaction }),
+      );
+      const txParams = {
+        from: testAddresses[0],
+        to: testAddresses[1],
+      };
+
+      const payload = { method: 'eth_signTransaction', params: [txParams] };
+      await pify(engine.handle).call(engine, payload);
+      expect(witnessedTxParams).toHaveLength(1);
+      expect(witnessedTxParams[0]).toStrictEqual(txParams);
+    });
+
     it('should throw when provided invalid address', async () => {
       const { engine } = createTestSetup();
       const getAccounts = async () => testAddresses.slice(0, 2);
diff --git a/src/wallet.ts b/src/wallet.ts
index 703390ea..c38a7316 100644
--- a/src/wallet.ts
+++ b/src/wallet.ts
@@ -154,9 +154,10 @@ WalletMiddlewareOptions): JsonRpcMiddleware<any, Block> {
       throw rpcErrors.invalidInput();
     }
 
-    const params = req.params as [TransactionParams?];
+    const params = req.params[0] as TransactionParams | undefined;
     const txParams: TransactionParams = {
-      from: await validateAndNormalizeKeyholder(params[0]?.from || '', req),
+      ...params,
+      from: await validateAndNormalizeKeyholder(params?.from || '', req),
     };
     res.result = await processTransaction(txParams, req);
   }
@@ -176,9 +177,10 @@ WalletMiddlewareOptions): JsonRpcMiddleware<any, Block> {
       throw rpcErrors.invalidInput();
     }
 
-    const params = req.params as [TransactionParams?];
+    const params = req.params[0] as TransactionParams | undefined;
     const txParams: TransactionParams = {
-      from: await validateAndNormalizeKeyholder(params[0]?.from || '', req),
+      ...params,
+      from: await validateAndNormalizeKeyholder(params?.from || '', req),
     };
     res.result = await processSignTransaction(txParams, req);
   }