diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index 09d11f2..ad45ac1 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -705,7 +705,8 @@ class Event(models.Model):
                         self.exact_location = p
                         break
             # try to detect category
-            CategorisationRule.apply_rules(self)
+            if not self.category:
+                CategorisationRule.apply_rules(self)
 
     def save(self, *args, **kwargs):
         self.prepare_save()