diff --git a/manifest.json b/manifest.json
index a11a7b0..28282c3 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,6 +1,7 @@
 {
     "name": "AgenDAV",
     "id": "agendav",
+    "packaging_format": 1,
     "description": {
         "en": "CalDAV web client",
         "fr": "Client web pour CalDAV"