diff --git a/src/mock.ts b/src/mock.ts
index 9f380e3f..9d325810 100644
--- a/src/mock.ts
+++ b/src/mock.ts
@@ -17,6 +17,7 @@ export class DiscordSDKMock implements IDiscordSDK {
   readonly source: Window | WindowProxy | null = null;
   readonly sourceOrigin: string = '';
 
+  private frameId = 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa';
   private eventBus = new EventEmitter();
   public commands: IDiscordSDK['commands'];
   readonly guildId: string | null;