diff --git a/modules/json_form_widget/tests/src/Unit/SchemaUiHandlerTest.php b/modules/json_form_widget/tests/src/Unit/SchemaUiHandlerTest.php
index a616b54b61..ca217469b9 100644
--- a/modules/json_form_widget/tests/src/Unit/SchemaUiHandlerTest.php
+++ b/modules/json_form_widget/tests/src/Unit/SchemaUiHandlerTest.php
@@ -523,7 +523,7 @@ public function testSchemaUi() {
         '#uri' => 'https://url.to.api.or.file',
         '#upload_location' => 'public://uploaded_resources',
         '#upload_validators' => [
-          'FileExtension' => ['jpg pdf png csv'],
+          'FileExtension' => ['extensions' => 'jpg pdf png csv'],
         ],
       ],
     ];