diff --git a/lib/Config/Migrator.php b/lib/Config/Migrator.php
index a0359ab27b..4c58cd4335 100644
--- a/lib/Config/Migrator.php
+++ b/lib/Config/Migrator.php
@@ -148,7 +148,8 @@ class Migrator {
       'created_at TIMESTAMP NULL,',
       'updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,',
       'deleted_at TIMESTAMP NULL,',
-      'PRIMARY KEY  (id)',
+      'PRIMARY KEY  (id),',
+      'KEY task_id (task_id)',
     );
     return $this->sqlify(__FUNCTION__, $attributes);
   }