diff --git a/modoboa/core/tests/test_authentication.py b/modoboa/core/tests/test_authentication.py
index 1b912a0b5..ae2465735 100644
--- a/modoboa/core/tests/test_authentication.py
+++ b/modoboa/core/tests/test_authentication.py
@@ -70,7 +70,6 @@ class AuthenticationTestCase(ModoTestCase):
 
     def test_password_scheme(self):
         """Validate password scheme changes."""
-        url = reverse("core:parameters")
         username = "user@test.com"
         password = "toto"
         data = {"username": username, "password": password}
@@ -79,26 +78,26 @@ class AuthenticationTestCase(ModoTestCase):
 
         self.client.logout()
         self.set_global_parameter("password_scheme", "sha512crypt")
-        response = self.client.post(reverse("core:login"), data)
+        self.client.post(reverse("core:login"), data)
         user.refresh_from_db()
         self.assertTrue(user.password.startswith("{SHA512-CRYPT}"))
 
         self.client.logout()
         self.set_global_parameter("password_scheme", "sha256")
-        response = self.client.post(reverse("core:login"), data)
+        self.client.post(reverse("core:login"), data)
         user.refresh_from_db()
         self.assertTrue(user.password.startswith("{SHA256}"))
 
         self.client.logout()
         self.set_global_parameter("password_scheme", "fallback_scheme")
-        response = self.client.post(reverse("core:login"), data)
+        self.client.post(reverse("core:login"), data)
         user.refresh_from_db()
         self.assertTrue(user.password.startswith(pw_hash.scheme))
 
         self.client.logout()
         self.set_global_parameter("password_scheme", "sha256crypt")
         self.set_global_parameter("update_scheme", False)
-        response = self.client.post(reverse("core:login"), data)
+        self.client.post(reverse("core:login"), data)
         user.refresh_from_db()
         self.assertTrue(user.password.startswith(pw_hash.scheme))
 
diff --git a/modoboa/core/views/auth.py b/modoboa/core/views/auth.py
index 45054f149..edf73cb0c 100644
--- a/modoboa/core/views/auth.py
+++ b/modoboa/core/views/auth.py
@@ -39,7 +39,7 @@ def dologin(request):
                                                     raise_exception=False):
                     # check if password scheme is correct
                     scheme = param_tools.get_global_parameter("password_scheme",
-                                                              raise_exception=False)
+                                                          raise_exception=False)
                     # use SHA512CRYPT as default fallback
                     if scheme is None:
                         pwhash = get_password_hasher('sha512crypt')()
@@ -47,7 +47,8 @@ def dologin(request):
                         pwhash = get_password_hasher(scheme)()
                     if not user.password.startswith(pwhash.scheme):
                         logging.info(
-                            _("Password scheme mismatch. Updating %s password") % user.username
+                            _("Password scheme mismatch. Updating %s password"),
+                            user.username
                         )
                         user.set_password(form.cleaned_data["password"])
                         user.save()