diff --git a/finance/models.py b/finance/models.py
index f1c972f..89a59f4 100755
--- a/finance/models.py
+++ b/finance/models.py
@@ -32,7 +32,7 @@ class Bill(models.Model):
             log = False
             try:
                 p = Progress.objects.get(user=self.user, course_token=str(self.course_token))
-                p.freeze = True
+                p.is_freeze = True
                 p.save()
             except Progress.DoesNotExist:
                 log = True