diff --git a/src/applications/differential/conduit/DifferentialCreateRawDiffConduitAPIMethod.php b/src/applications/differential/conduit/DifferentialCreateRawDiffConduitAPIMethod.php
--- a/src/applications/differential/conduit/DifferentialCreateRawDiffConduitAPIMethod.php
+++ b/src/applications/differential/conduit/DifferentialCreateRawDiffConduitAPIMethod.php
@@ -71,12 +71,14 @@
     $xactions = array(
       id(new DifferentialDiffTransaction())
         ->setTransactionType(DifferentialDiffTransaction::TYPE_DIFF_CREATE)
+        ->setIsCreateTransaction(true)
         ->setNewValue($diff_data_dict),
     );
 
     if ($request->getValue('viewPolicy')) {
       $xactions[] = id(new DifferentialDiffTransaction())
         ->setTransactionType(PhabricatorTransactions::TYPE_VIEW_POLICY)
+        ->setIsCreateTransaction(true)
         ->setNewValue($request->getValue('viewPolicy'));
     }