diff --git a/services/track-changes/test/unit/coffee/DocArchive/MongoAWS.coffee b/services/track-changes/test/unit/coffee/DocArchive/MongoAWS.coffee
index 8c23b82f72..2dc289d89a 100644
--- a/services/track-changes/test/unit/coffee/DocArchive/MongoAWS.coffee
+++ b/services/track-changes/test/unit/coffee/DocArchive/MongoAWS.coffee
@@ -30,7 +30,7 @@ describe "MongoAWS", ->
 
 		@project_id = ObjectId().toString()
 		@doc_id = ObjectId().toString()
-		@pack_id = ObjectId().toString()
+		@pack_id = ObjectId()
 		@update = { v:123 }
 		@callback = sinon.stub()