diff --git a/src/agenda_culturel/celery.py b/src/agenda_culturel/celery.py
index e0bddca..395d871 100644
--- a/src/agenda_culturel/celery.py
+++ b/src/agenda_culturel/celery.py
@@ -73,7 +73,7 @@ def close_import_task(taskid, success, error_message, importer):
 
     fields = ["status", "nb_initial", "nb_updated", "nb_imported", "nb_removed"]
     if not success:
-        task.error_message = error_message
+        task.error_message = error_message[:512]
         fields.append("error_message")
     task.save(update_fields=fields)