diff -u b/search_api_db/src/Plugin/search_api/backend/Database.php b/search_api_db/src/Plugin/search_api/backend/Database.php
--- b/search_api_db/src/Plugin/search_api/backend/Database.php
+++ b/search_api_db/src/Plugin/search_api/backend/Database.php
@@ -1908,7 +1908,7 @@
           }
         }
         $or_db_query = $this->createDbQuery($or_query, $fields);
-        $select = Database::getConnection()->select($or_db_query, 't');
+        $select = $this->database->select($or_db_query, 't');
       }
 
       // If "Include missing facet" is disabled, we use an INNER JOIN and add IS