diff --git a/apps/activity/forms.py b/apps/activity/forms.py
index 305c4f03..a865ece6 100644
--- a/apps/activity/forms.py
+++ b/apps/activity/forms.py
@@ -32,7 +32,7 @@ class ActivityForm(forms.ModelForm):
     def clean_organizer(self):
         organizer = self.cleaned_data['organizer']
         if not organizer.note.is_active:
-            self.add_error('organiser', _('The note of this club is inactive.'))
+            self.add_error('organizer', _('The note of this club is inactive.'))
         return organizer
 
     def clean_date_end(self):