diff --git a/src/applications/phriction/controller/PhrictionDiffController.php b/src/applications/phriction/controller/PhrictionDiffController.php
--- a/src/applications/phriction/controller/PhrictionDiffController.php
+++ b/src/applications/phriction/controller/PhrictionDiffController.php
@@ -91,6 +91,7 @@
 
     $parser->setRange($range_s, $range_e);
     $parser->setMask($mask);
+    $parser->setHighlightAs('remarkup');
 
     if ($request->isAjax()) {
       return id(new PhabricatorChangesetResponse())