diff --git a/src/Auth/OAuth.php b/src/Auth/OAuth.php
index 2bfa4e3c0..89dde432f 100644
--- a/src/Auth/OAuth.php
+++ b/src/Auth/OAuth.php
@@ -103,7 +103,7 @@ abstract class OAuth
      /**
       * @return array
       */
-    protected function getScopes(){
+    protected function getScopes():array{
         return $this->scopes;
     }