diff --git a/src/backend/core/factories.py b/src/backend/core/factories.py
index 90aa9d3..80aca09 100644
--- a/src/backend/core/factories.py
+++ b/src/backend/core/factories.py
@@ -124,6 +124,7 @@ class UserFactory(factory.django.DjangoModelFactory):
 
     class Meta:
         model = models.User
+        django_get_or_create = ("email",)
 
     email = factory.Faker("email")
     language = factory.fuzzy.FuzzyChoice([lang[0] for lang in settings.LANGUAGES])
diff --git a/src/backend/core/tests/test_models_users.py b/src/backend/core/tests/test_models_users.py
index a965e78..d522f74 100644
--- a/src/backend/core/tests/test_models_users.py
+++ b/src/backend/core/tests/test_models_users.py
@@ -36,13 +36,13 @@ def test_models_users_email_unique():
     with pytest.raises(
         ValidationError, match="User with this Email address already exists."
     ):
-        factories.UserFactory(email=user.email)
+        models.User.objects.create(email=user.email)
 
 
 def test_models_users_email_several_null():
     """Several users with a null value for the "email" field can co-exist."""
     factories.UserFactory(email=None)
-    factories.UserFactory(email=None)
+    models.User.objects.create(email=None, password="foo.")
 
     assert models.User.objects.filter(email__isnull=True).count() == 2