diff --git a/src/Schema/Extensions/GraphQLExtension.php b/src/Schema/Extensions/GraphQLExtension.php
index <HASH>..<HASH> 100644
--- a/src/Schema/Extensions/GraphQLExtension.php
+++ b/src/Schema/Extensions/GraphQLExtension.php
@@ -14,7 +14,7 @@ abstract class GraphQLExtension implements \JsonSerializable
      *
      * @return DocumentAST
      */
-    public function manipulateSchema(DocumentAST $current, DocumentAST $original): DocumentAST
+    public function manipulateSchema(DocumentAST $current, DocumentAST $original)
     {
         return $current;
     }
Remove return type to match Laravel style