diff --git a/gpodder/views.py b/gpodder/views.py
index 6aa4292..5b808ef 100644
--- a/gpodder/views.py
+++ b/gpodder/views.py
@@ -140,7 +140,7 @@ def subscriptions_by_device(request, username, deviceid):
         since = request.GET.get('since')
         if since:
             added, removed = _subscription_changes_since(request.user, since)
-            return JsonResponse({'add': added, 'remove': removed, 'timestamp': _now_ts()})
+            return JsonResponse({'add': added, 'remove': removed, 'timestamp': _now_ts(), 'update_urls': []})
         else:
             urls = list(PodcastFeed.objects.filter(user=request.user).values_list('rss_url', flat=True))
             return JsonResponse(urls, safe=False)
@@ -180,7 +180,7 @@ def subscriptions_all(request, username):
     since = request.GET.get('since')
     if since:
         added, removed = _subscription_changes_since(request.user, since)
-        return JsonResponse({'add': added, 'remove': removed, 'timestamp': _now_ts()})
+        return JsonResponse({'add': added, 'remove': removed, 'timestamp': _now_ts(), 'update_urls': []})
     else:
         urls = list(PodcastFeed.objects.filter(user=request.user).values_list('rss_url', flat=True))
         return JsonResponse(urls, safe=False)