diff --git a/src/oauth2server/DbInterface.php b/src/oauth2server/DbInterface.php
index 3435c41b..b567c90e 100644
--- a/src/oauth2server/DbInterface.php
+++ b/src/oauth2server/DbInterface.php
@@ -60,9 +60,4 @@ interface OAuth2ServerDatabase
     );
 
     public function accessTokenScopes(string $accessToken);
-
-    public function validateUser(
-        string $username,
-        string $password
-    );
 }
\ No newline at end of file