diff --git a/src/unique_user_email/apps.py b/src/unique_user_email/apps.py
index d407dfb..4a3894a 100644
--- a/src/unique_user_email/apps.py
+++ b/src/unique_user_email/apps.py
@@ -22,5 +22,4 @@ def ready(self):
             ),
         ]
         User._meta.constraints = User.Meta.constraints
-        # ... as long as original_attrs is not updated.
-        # User._meta.original_attrs["constraints"] = User.Meta.constraints
+        User._meta.original_attrs["constraints"] = User.Meta.constraints
diff --git a/tests/tests.py b/tests/tests.py
index fd87b87..daf7fba 100644
--- a/tests/tests.py
+++ b/tests/tests.py
@@ -6,6 +6,7 @@
 from django.test import TestCase
 from unique_user_email.backend import EmailBackend
 from unique_user_email.forms import AuthenticationForm
+from django.db.models.constraints import UniqueConstraint
 
 
 class UniqueEmailTestCase(TestCase):
@@ -55,6 +56,13 @@ def test_model_save_disallows_duplicate_emails(self):
         ):
             user2.save()
 
+    def test_user_constraints(self):
+        self.assertIsInstance(User._meta.constraints[0], UniqueConstraint)
+        self.assertEqual("unique_user_email", User._meta.constraints[0].name)
+        self.assertEqual(
+            "unique_user_email",
+            User._meta.original_attrs.get("constraints")[0].name
+        )
 
 class EmailBackendTests(TestCase):
     def test_none_for_username_logins(self):