diff --git a/src/applications/diffusion/controller/base/DiffusionController.php b/src/applications/diffusion/controller/base/DiffusionController.php
index a62d6bb30b..1d583cea71 100644
--- a/src/applications/diffusion/controller/base/DiffusionController.php
+++ b/src/applications/diffusion/controller/base/DiffusionController.php
@@ -292,7 +292,7 @@ abstract class DiffusionController extends PhabricatorController {
         array(
           'href' => $drequest->generateURI(
             array(
-              'commit' => null,
+              'commit' => '',
             ) + $uri_params),
         ),
         'Jump to HEAD');