diff --git a/keyring/backends/kwallet.py b/keyring/backends/kwallet.py
index 6326971a..12775706 100644
--- a/keyring/backends/kwallet.py
+++ b/keyring/backends/kwallet.py
@@ -123,7 +123,8 @@ def get_credential(self, service, username):
         Otherwise, it will return the first username and password combo that it finds.
         """
         if username is not None:
-            return self.get_password(service, username)
+            return super().get_credential(service, username)
+
         if not self.connected(service):
             # the user pressed "cancel" when prompted to unlock their keyring.
             raise KeyringLocked("Failed to unlock the keyring!")
@@ -134,6 +135,8 @@ def get_credential(self, service, username):
             )
             return SimpleCredential(str(username), str(password))
 
+        return None
+
     def set_password(self, service, username, password):
         """Set password for the username of the service"""
         if not self.connected(service):