diff --git a/src/main/desktop-storage-electron-fixture.ts b/src/main/desktop-storage-electron-fixture.ts
index 6953bdc8..cc122932 100644
--- a/src/main/desktop-storage-electron-fixture.ts
+++ b/src/main/desktop-storage-electron-fixture.ts
@@ -212,9 +212,12 @@ async function run(): Promise<void> {
   while (Reflect.get(lost, 'state') !== 'failed') await new Promise(resolve => setImmediate(resolve))
   await assert.rejects(lost.call('assistant', 'saveLocalConversations', [[{
     header: { id: neverReplayId, title: 'Never replay', updatedAt: 123 }, messages: neverReplayMessages
-  }]]), error => error?.code === 'STORAGE_UNCONFIRMED' ||
-    error?.message === 'Storage is not ready' ||
-    error?.message === 'Desktop storage is not ready; await storage.ready before calling')
+  }]]), error => {
+    const failure = error as { code?: unknown; message?: unknown }
+    return failure.code === 'STORAGE_UNCONFIRMED' ||
+      failure.message === 'Storage is not ready' ||
+      failure.message === 'Desktop storage is not ready; await storage.ready before calling'
+  })
   await assert.rejects(lost.call('assistant', 'listProjects', []), /not ready/)
   await lost.retry()
   await lost.ready