diff --git a/src/workflow/ArcanistDiffWorkflow.php b/src/workflow/ArcanistDiffWorkflow.php
--- a/src/workflow/ArcanistDiffWorkflow.php
+++ b/src/workflow/ArcanistDiffWorkflow.php
@@ -745,6 +745,8 @@
       if ($this->commitMessageFromRevision == $remote_corpus) {
         $new_message = $message;
       } else {
+        $remote_corpus = ArcanistCommentRemover::removeComments(
+          $remote_corpus);
         $new_message = ArcanistDifferentialCommitMessage::newFromRawCorpus(
           $remote_corpus);
         $new_message->pullDataFromConduit($conduit);