diff --git a/src/servers/src/mysql/handler.rs b/src/servers/src/mysql/handler.rs
index abf417996c09..587742687d82 100644
--- a/src/servers/src/mysql/handler.rs
+++ b/src/servers/src/mysql/handler.rs
@@ -249,7 +249,7 @@ impl<W: AsyncWrite + Send + Sync + Unpin> AsyncMysqlShim<W> for MysqlInstanceShi
         self.auth_plugin()
     }
 
-    async fn auth_plugin_for_username(&self, _user: &[u8]) -> &str {
+    async fn auth_plugin_for_username<'a, 'user>(&'a self, _user: &'user [u8]) -> &'a str {
         self.auth_plugin()
     }