diff --git a/src/media/mediaQueue.ts b/src/media/mediaQueue.ts
index 5460c43..ea224e2 100644
--- a/src/media/mediaQueue.ts
+++ b/src/media/mediaQueue.ts
@@ -9,7 +9,7 @@ export class MediaQueue {
   private readonly items: MediaQueueItem[] = [];
 
   constructor(
-    private readonly createId = () => crypto.randomUUID(),
+    private readonly createId: () => string = () => crypto.randomUUID(),
     private readonly now = () => Date.now(),
   ) {}