diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index 1439adb..d529e99 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -1372,6 +1372,11 @@ class Event(models.Model):
             if uuid not in self.uuids:
                 self.uuids.append(uuid)
 
+        # add possible missing sources
+        for source in other.import_sources:
+            if source not in self.import_sources:
+                self.import_sources.append(source)
+
     # Limitation: the given events should not be considered similar one to another...
     def import_events(events, remove_missing_from_source=None):
 
@@ -1462,7 +1467,7 @@ class Event(models.Model):
         nb_updated = Event.objects.bulk_update(
             to_update,
             fields=Event.data_fields(no_m2m=True)
-            + ["imported_date", "modified_date", "uuids", "status"],
+            + ["imported_date", "modified_date", "uuids", "status", "import_sources"],
         )
 
         nb_draft = 0