diff --git a/controllers/grid/catalogEntry/PublicationFormatGridCellProvider.php b/controllers/grid/catalogEntry/PublicationFormatGridCellProvider.php
index 2153c22ccbf..27054cbfce1 100644
--- a/controllers/grid/catalogEntry/PublicationFormatGridCellProvider.php
+++ b/controllers/grid/catalogEntry/PublicationFormatGridCellProvider.php
@@ -17,6 +17,7 @@
 namespace APP\controllers\grid\catalogEntry;
 
 use APP\core\Application;
+use APP\publicationFormat\PublicationFormat;
 use PKP\controllers\api\file\linkAction\AddFileLinkAction;
 use PKP\controllers\grid\DataObjectGridCellProvider;
 use PKP\controllers\grid\files\fileList\linkAction\SelectFilesLinkAction;
@@ -97,8 +98,7 @@ public function getTemplateVarsFromRowColumn($row, $column)
     {
         $data = $row->getData();
 
-        if (is_a($data, 'Representation')) {
-            /** @var Representation $data */
+        if ($data instanceof PublicationFormat) {
             switch ($column->getId()) {
                 case 'indent': return [];
                 case 'name':
@@ -151,7 +151,7 @@ public function getCellActions($request, $row, $column, $position = GridHandler:
     {
         $data = $row->getData();
         $router = $request->getRouter();
-        if (is_a($data, 'Representation')) {
+        if ($data instanceof PublicationFormat) {
             switch ($column->getId()) {
                 case 'isAvailable':
                     return [new LinkAction(