diff --git a/src/applications/differential/conduit/DifferentialCreateDiffConduitAPIMethod.php b/src/applications/differential/conduit/DifferentialCreateDiffConduitAPIMethod.php
--- a/src/applications/differential/conduit/DifferentialCreateDiffConduitAPIMethod.php
+++ b/src/applications/differential/conduit/DifferentialCreateDiffConduitAPIMethod.php
@@ -137,7 +137,7 @@
     );
 
     $xactions = array(
-      id(new DifferentialTransaction())
+      id(new DifferentialDiffTransaction())
         ->setTransactionType(DifferentialDiffTransaction::TYPE_DIFF_CREATE)
         ->setNewValue($diff_data_dict),
     );
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
@@ -72,13 +72,13 @@
     );
 
     $xactions = array(
-      id(new DifferentialTransaction())
+      id(new DifferentialDiffTransaction())
         ->setTransactionType(DifferentialDiffTransaction::TYPE_DIFF_CREATE)
         ->setNewValue($diff_data_dict),
     );
 
     if ($request->getValue('viewPolicy')) {
-      $xactions[] = id(new DifferentialTransaction())
+      $xactions[] = id(new DifferentialDiffTransaction())
         ->setTransactionType(PhabricatorTransactions::TYPE_VIEW_POLICY)
         ->setNewValue($request->getValue('viewPolicy'));
     }