diff --git a/keyring/testing/backend.py b/keyring/testing/backend.py
index 74c1e476..89a414bf 100644
--- a/keyring/testing/backend.py
+++ b/keyring/testing/backend.py
@@ -195,6 +195,6 @@ def test_wrong_username_returns_none(self):
 
         assert keyring.get_credential(service, "user1").password == password_1
         assert keyring.get_credential(service, "user2").password == password_2
-        
+
         # Missing/wrong username should not return a cred
         assert keyring.get_credential(service, "nobody!") is None