diff --git a/tests/auth_test.py b/tests/auth_test.py
index b2afe88..613dda5 100644
--- a/tests/auth_test.py
+++ b/tests/auth_test.py
@@ -178,7 +178,7 @@ def test_disallowed_hostname(
         callback_url = 'https://example.com/callback'
 
         with self.assertRaisesRegex(
-                ValueError, 'disallowed hostname example.com'):
+                ValueError, 'Disallowed hostname example.com'):
             auth.client_from_login_flow(
                     API_KEY, APP_SECRET, callback_url, self.token_path)
 
@@ -193,7 +193,7 @@ def test_disallowed_hostname_with_port(
         callback_url = 'https://example.com:8080/callback'
 
         with self.assertRaisesRegex(
-                ValueError, 'disallowed hostname example.com'):
+                ValueError, 'Disallowed hostname example.com'):
             auth.client_from_login_flow(
                     API_KEY, APP_SECRET, callback_url, self.token_path)