diff --git a/finance/models.py b/finance/models.py
index baf8d70..5d3c6cb 100755
--- a/finance/models.py
+++ b/finance/models.py
@@ -27,7 +27,7 @@ class Bill(models.Model):
     def __str__(self):
         return '%s: %s' % (self.id, self.user)
 
-    def freeze_course(self, user):
+    def freeze_course(self):
         if self.invoice_set.exclude(status='F').exists():
             log = False
             try: