diff --git a/manifest.json b/manifest.json
index 02f3aa8..4501313 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,7 @@
 {
     "name": "OpenSondage",
     "id": "opensondage",
+    "packaging_format": 1,
     "description": {
         "en": "OpenSondage is an online service for planning an appointment or making a decision quickly and easily. No registration is required.",
         "fr": "OpenSondage sert à faire des sondages sans authentification pour trouver une date de réunion qui convienne à toutes les personnes concernées.",