diff --git a/src/applications/diffusion/query/DiffusionCommitQuery.php b/src/applications/diffusion/query/DiffusionCommitQuery.php
--- a/src/applications/diffusion/query/DiffusionCommitQuery.php
+++ b/src/applications/diffusion/query/DiffusionCommitQuery.php
@@ -72,6 +72,7 @@
    */
   public function withRepositoryPHIDs(array $phids) {
     $this->repositoryPHIDs = $phids;
+    return $this;
   }
 
   /**