diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index 5b2a83c..7f7dd06 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -718,7 +718,7 @@ class Event(models.Model):
                         self.exact_location = p
                         break
             # try to detect category
-            if not self.category:
+            if not self.category or self.category.name == Category.default_name:
                 CategorisationRule.apply_rules(self)
 
     def save(self, *args, **kwargs):