diff --git a/src/workflow/ArcanistDiffWorkflow.php b/src/workflow/ArcanistDiffWorkflow.php
index dc10fa94..f589ec38 100644
--- a/src/workflow/ArcanistDiffWorkflow.php
+++ b/src/workflow/ArcanistDiffWorkflow.php
@@ -1855,6 +1855,7 @@ EOTEXT
     $local = $repository_api->getLocalCommitInformation();
     if ($local) {
       $result = $this->parseCommitMessagesIntoFields($local);
+      unset($result[0]['revisionID']);
     }
 
     $result[0] = $this->dispatchWillBuildEvent($result[0]);