diff --git a/papi/main.py b/papi/main.py
index 6bc7412..58c7116 100644
--- a/papi/main.py
+++ b/papi/main.py
@@ -212,6 +212,8 @@ def list_notification_as_text(
         return
     mesures = sonde.mesures
 
+    res = []
+
     for previous, present in zip(mesures, mesures[1:]):
         date = present.content["date"]
         previous = utils.prepare(previous.content)
@@ -219,7 +221,6 @@ def list_notification_as_text(
         all_channels = sorted(set((*previous["channels"], *present["channels"])))
 
         diff = utils.compare(all_channels, previous, present)
-        res = []
         if diff:
             for d in diff["changements"]:
                 line = date, *utils.clean_state(d)