diff --git a/src/applications/maniphest/conduit/ManiphestGetTaskTransactionsConduitAPIMethod.php b/src/applications/maniphest/conduit/ManiphestGetTaskTransactionsConduitAPIMethod.php
--- a/src/applications/maniphest/conduit/ManiphestGetTaskTransactionsConduitAPIMethod.php
+++ b/src/applications/maniphest/conduit/ManiphestGetTaskTransactionsConduitAPIMethod.php
@@ -59,6 +59,7 @@
 
       $results[$task_id][] = array(
         'taskID'  => $task_id,
+        'transactionID' => $transaction->getID(),
         'transactionPHID' => $transaction->getPHID(),
         'transactionType'  => $transaction->getTransactionType(),
         'oldValue'  => $transaction->getOldValue(),