diff --git a/lib/Db/ItemMapper.php b/lib/Db/ItemMapper.php
index 2b07a570fd..17f6638def 100644
--- a/lib/Db/ItemMapper.php
+++ b/lib/Db/ItemMapper.php
@@ -225,7 +225,7 @@ public function findAllNewFolder(?int $id, int $updatedSince, bool $showAll, str
         $sql = $this->buildStatusQueryPart($showAll);
 
         $folderWhere = is_null($id) ? 'IS' : '=';
-        $sql .= "AND `feeds`.`folder_id` ${$folderWhere} ? " .
+        $sql .= "AND `feeds`.`folder_id` ${folderWhere} ? " .
             'AND `items`.`last_modified` >= ? ';
         $sql = $this->makeSelectQuery($sql);
         $params = [$userId, $id, $updatedSince];