diff --git a/grade/classes/external/get_feedback.php b/grade/classes/external/get_feedback.php
index 388063426cb..fd94c21f54f 100644
--- a/grade/classes/external/get_feedback.php
+++ b/grade/classes/external/get_feedback.php
@@ -108,7 +108,7 @@ class get_feedback extends external_api {
             'title' => new external_value(PARAM_TEXT, 'Title of the grade item that the feedback is for'),
             'fullname' => new external_value(PARAM_TEXT, 'Students name'),
             'picture' => new external_value(PARAM_RAW, 'Students picture'),
-            'additionalfield' => new external_value(PARAM_TEXT, 'Additional field for the user (email or ID number, for example)'),
+            'additionalfield' => new external_value(PARAM_RAW, 'Additional field for the user (email or ID number, for example)'),
         ]);
     }
 }