diff --git a/openml_OS/models/api/v1/Api_data.php b/openml_OS/models/api/v1/Api_data.php
index 294d1300..a8dcc308 100644
--- a/openml_OS/models/api/v1/Api_data.php
+++ b/openml_OS/models/api/v1/Api_data.php
@@ -792,7 +792,7 @@ private function data($data_id) {
 
     $dataset = $this->Dataset->getById( $data_id );
     if( $dataset === false ) {
-      $this->returnError( 111, $this->version );
+      $this->returnError(111, $this->version, 404);
       return;
     }