diff --git a/src/applications/differential/phid/DifferentialDiffPHIDType.php b/src/applications/differential/phid/DifferentialDiffPHIDType.php
index 2b1445829d..dec988db48 100644
--- a/src/applications/differential/phid/DifferentialDiffPHIDType.php
+++ b/src/applications/differential/phid/DifferentialDiffPHIDType.php
@@ -36,7 +36,7 @@ final class DifferentialDiffPHIDType extends PhabricatorPHIDType {
       $revision_id = $diff->getRevisionID();
 
       $handle->setName(pht('Diff %d', $id));
-      $handle->setURI("D{$revision_id}.{$id}.html");
+      $handle->setURI("D{$revision_id}.id{$id}.html");
     }
   }