diff --git a/phpBB/includes/auth/provider/base.php b/phpBB/includes/auth/provider/base.php
index e053a1829b..7961bf4dde 100644
--- a/phpBB/includes/auth/provider/base.php
+++ b/phpBB/includes/auth/provider/base.php
@@ -30,11 +30,6 @@ abstract class phpbb_auth_provider_base implements phpbb_auth_provider_interface
 		return;
 	}
 
-	/**
-	 * {@inheritdoc}
-	 */
-	abstract public function login($username, $password);
-
 	/**
 	 * {@inheritdoc}
 	 */