diff --git a/src/applications/differential/conduit/DifferentialCreateInlineConduitAPIMethod.php b/src/applications/differential/conduit/DifferentialCreateInlineConduitAPIMethod.php
--- a/src/applications/differential/conduit/DifferentialCreateInlineConduitAPIMethod.php
+++ b/src/applications/differential/conduit/DifferentialCreateInlineConduitAPIMethod.php
@@ -100,7 +100,7 @@
       ->setChangesetID($cid)
       ->setAuthorPHID($request->getUser()->getPHID())
       ->setContent($request->getValue('content'))
-      ->setIsNewFile($request->getValue('isNewFile'))
+      ->setIsNewFile((int)$request->getValue('isNewFile'))
       ->setLineNumber($request->getValue('lineNumber'))
       ->setLineLength($request->getValue('lineLength', 0))
       ->save();