diff --git a/src/applications/maniphest/conduit/ConduitAPI_maniphest_Method.php b/src/applications/maniphest/conduit/ConduitAPI_maniphest_Method.php
--- a/src/applications/maniphest/conduit/ConduitAPI_maniphest_Method.php
+++ b/src/applications/maniphest/conduit/ConduitAPI_maniphest_Method.php
@@ -260,6 +260,7 @@
         'ownerPHID'    => $task->getOwnerPHID(),
         'ccPHIDs'      => $task->getCCPHIDs(),
         'status'       => $task->getStatus(),
+        'isClosed'     => $task->isClosed(),
         'priority'     => ManiphestTaskPriority::getTaskPriorityName(
           $task->getPriority()),
         'title'        => $task->getTitle(),