diff --git a/plugin/ims_lti/src/Service/Resource/LtiResultsResource.php b/plugin/ims_lti/src/Service/Resource/LtiResultsResource.php
index 2afa5e3862..7eba1a73ca 100644
--- a/plugin/ims_lti/src/Service/Resource/LtiResultsResource.php
+++ b/plugin/ims_lti/src/Service/Resource/LtiResultsResource.php
@@ -60,7 +60,7 @@ class LtiResultsResource extends LtiAgsResource
             throw new AccessDeniedHttpException('Tool not found in course.');
         }
 
-        if ($this->request->server->get('HTTP_ACCEPT') !== LtiAssignmentGradesService::TYPE_LINE_ITEM) {
+        if ($this->request->server->get('HTTP_ACCEPT') !== LtiAssignmentGradesService::TYPE_RESULT_CONTAINER) {
             throw new UnsupportedMediaTypeHttpException('Unsupported media type.');
         }