diff --git a/model_utils/fields.py b/model_utils/fields.py
index 0a3f9cf..f54f0ee 100644
--- a/model_utils/fields.py
+++ b/model_utils/fields.py
@@ -114,7 +114,7 @@ class MonitorField(models.DateTimeField):
             # Fix related to issue #241 to avoid recursive error on double monitor fields
             return
         setattr(instance, self.monitor_attname,
-            self.get_monitored_value(instance))
+                self.get_monitored_value(instance))
 
     def pre_save(self, model_instance, add):
         value = now()