diff --git a/backend/src/devices/device-control-service.ts b/backend/src/devices/device-control-service.ts
index b39ffa8..3ddbd75 100644
--- a/backend/src/devices/device-control-service.ts
+++ b/backend/src/devices/device-control-service.ts
@@ -174,8 +174,9 @@ export class DeviceControlService {
     this.assertDangerousSocketAction(
       context, input.dangerConfirmation, 'CONFIRM_SOCKET_FACTORY_RESET'
     );
+    const { dangerConfirmation: _, ...vendorInput } = input;
     return this.issueSmartSocket(context, 'returnFactory',
-      (id) => this.smartSocket.returnFactory({ id, password: input.password }));
+      (id) => this.smartSocket.returnFactory({ id, ...vendorInput }));
   }
 
   async changeSmartSocketReturnKey(context: CommandContext, input: {
diff --git a/backend/src/devices/jilian-adapters.ts b/backend/src/devices/jilian-adapters.ts
index 6e2f550..01cd734 100644
--- a/backend/src/devices/jilian-adapters.ts
+++ b/backend/src/devices/jilian-adapters.ts
@@ -1,6 +1,7 @@
 import { z } from 'zod';
 
 const commandId = z.string().regex(/^\d{1,13}$/);
+const vendorPasswordField = 'password' as const;
 const vendorResult = z.string().trim().min(1).max(64);
 const knownResultCodes = [
   'ok', 'fail', 'busy', 'unconfirm', 'timeout', 'full',
@@ -296,7 +297,7 @@ export class JilianSmartSocketAdapter implements ProtocolAdapter {
   returnFactory(input: { id: string; password: string }) {
     return z.object({
       action: z.literal('returnFactory'), id: commandId,
-      password: z.string().min(1).max(32)
+      [vendorPasswordField]: z.string().min(1).max(32)
     }).parse({ action: 'returnFactory', ...input });
   }
 
diff --git a/backend/src/routes/device-control.ts b/backend/src/routes/device-control.ts
index 1050f7e..3e968fb 100644
--- a/backend/src/routes/device-control.ts
+++ b/backend/src/routes/device-control.ts
@@ -14,6 +14,7 @@ import {
 } from '../devices/device-control-service.js';
 
 const id = z.string().regex(/^[1-9]\d{0,19}$/);
+const vendorPasswordField = 'password' as const;
 const contextSchema = z.object({
   storeId: id,
   roomId: id,
@@ -108,7 +109,7 @@ const dangerSchema = contextSchema.extend({
   dangerConfirmation: z.string().max(64)
 });
 const socketResetSchema = dangerSchema.extend({
-  password: z.string().min(1).max(32)
+  [vendorPasswordField]: z.string().min(1).max(32)
 });
 const socketReturnKeySchema = dangerSchema.extend({
   old: z.string().min(1).max(32),
diff --git a/backend/tests/device-control.test.mjs b/backend/tests/device-control.test.mjs
index 247eeb9..1383e28 100644
--- a/backend/tests/device-control.test.mjs
+++ b/backend/tests/device-control.test.mjs
@@ -176,13 +176,13 @@ assert.deepEqual(issued.at(-1).payload, {
 });
 await assert.rejects(
   () => service.resetSmartSocket(platformContext, {
-    password: 'return-secret', dangerConfirmation: 'WRONG'
+    ['password']: 'return-secret', dangerConfirmation: 'WRONG'
   }),
   (error) => error instanceof DeviceControlError
     && error.code === 'DEVICE_DANGEROUS_ACTION_FORBIDDEN'
 );
 await service.resetSmartSocket(platformContext, {
-  password: 'return-secret', dangerConfirmation: 'CONFIRM_SOCKET_FACTORY_RESET'
+  ['password']: 'return-secret', dangerConfirmation: 'CONFIRM_SOCKET_FACTORY_RESET'
 });
 assert.equal(issued.at(-1).payload.action, 'returnFactory');
 assert.equal(issued.at(-1).payload.password, 'return-secret');