diff --git a/wallet-gateway/remote/src/config/Config.test.ts b/wallet-gateway/remote/src/config/Config.test.ts
index 146374d91..010d139ad 100644
--- a/wallet-gateway/remote/src/config/Config.test.ts
+++ b/wallet-gateway/remote/src/config/Config.test.ts
@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0
 
 import { expect, test } from 'vitest'
+import { serverConfigSchema } from './Config.js'
 import { ConfigUtils } from './ConfigUtils.js'
 
 test('config from json file', async () => {
@@ -28,3 +29,8 @@ test('config from json file', async () => {
         )
     }
 })
+
+test('server.signingWorker is fully optional and defaults when omitted', () => {
+    const parsed = serverConfigSchema.parse({})
+    expect(parsed.signingWorker.pollInterval).toBe(5000)
+})