diff --git a/src/applications/maniphest/query/ManiphestTaskQuery.php b/src/applications/maniphest/query/ManiphestTaskQuery.php
--- a/src/applications/maniphest/query/ManiphestTaskQuery.php
+++ b/src/applications/maniphest/query/ManiphestTaskQuery.php
@@ -641,9 +641,9 @@
 
     if ($this->hasOpenSubtasks !== null) {
       if ($this->hasOpenSubtasks) {
-        $join_type = 'JOIN';
+        $join_type = qsprintf($conn, 'JOIN');
       } else {
-        $join_type = 'LEFT JOIN';
+        $join_type = qsprintf($conn, 'LEFT JOIN');
       }
 
       $joins[] = qsprintf(