diff --git a/CRM/Contact/Form/Task/PDFTrait.php b/CRM/Contact/Form/Task/PDFTrait.php
index b5cc18541d9c..61e4faad36d9 100644
--- a/CRM/Contact/Form/Task/PDFTrait.php
+++ b/CRM/Contact/Form/Task/PDFTrait.php
@@ -283,7 +283,7 @@ public function postProcess(): void {
         civicrm_api3('Attachment', 'create', [
           'entity_table' => 'civicrm_activity',
           'entity_id' => $activityId,
-          'name' => $fileName,
+          'name' => $fileName . '.' . $type,
           'mime_type' => $mimeType,
           'options' => [
             'move-file' => $tee->getFileName(),