diff --git a/src/wp-admin/upload.php b/src/wp-admin/upload.php
index f679eb9d67..cb6c6cb608 100644
--- a/src/wp-admin/upload.php
+++ b/src/wp-admin/upload.php
@@ -249,7 +249,7 @@ if ( 'grid' === $mode ) {
 		wp_admin_notice(
 			$js_required_message,
 			array(
-				additional_classes( 'error', 'hide-if-js' ),
+				'additional_classes' => array( 'error', 'hide-if-js' ),
 			)
 		);
 		?>