diff --git a/django_any/models.py b/django_any/models.py
index de21c41..9105911 100644
--- a/django_any/models.py
+++ b/django_any/models.py
@@ -46,7 +46,7 @@ def wrapper(field, **kwargs):
         if kwargs.get('isnull', False):
             return None
 
-        if field.blank and random.random < 0.1:
+        if field.blank and random.random() < 0.1:
             return None
         return function(field, **kwargs)
     return wrapper