diff --git a/tracker/models.py b/tracker/models.py
index 5ef8d4a..8a97b0b 100644
--- a/tracker/models.py
+++ b/tracker/models.py
@@ -82,6 +82,7 @@ class Milestone(models.Model):
 
     class Meta:
         ordering = ['due_date']
+        unique_together = ['project', 'name']
 
     name_validator = RegexValidator(regex='^[a-z0-9_.-]+$',
             message="Please enter only lowercase characters, number, "
@@ -91,9 +92,6 @@ class Milestone(models.Model):
 
     name = models.CharField(max_length=32, validators=[name_validator])
 
-    class Meta:
-        unique_together = ['project', 'name']
-
     due_date = models.DateTimeField(blank=True, null=True)
 
     closed = models.BooleanField(default=False)