diff --git a/src/applications/differential/editor/DifferentialTransactionEditor.php b/src/applications/differential/editor/DifferentialTransactionEditor.php
index 0f9c6d975c..b7e09edca0 100644
--- a/src/applications/differential/editor/DifferentialTransactionEditor.php
+++ b/src/applications/differential/editor/DifferentialTransactionEditor.php
@@ -1410,7 +1410,7 @@ final class DifferentialTransactionEditor
 
     // Apply build plans.
     HarbormasterBuildable::applyBuildPlans(
-      $adapter->getDiff(),
+      $adapter->getDiff()->getPHID(),
       $adapter->getPHID(),
       $adapter->getBuildPlans());