diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index 2d16a4b..0771a7f 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -24,6 +24,7 @@
 <link rel="import" href="../gr-diff-highlight/gr-diff-highlight.html">
 <link rel="import" href="../gr-diff-selection/gr-diff-selection.html">
 <link rel="import" href="../gr-syntax-themes/gr-syntax-theme.html">
+<link rel="import" href="../gr-ranged-comment-themes/gr-ranged-comment-theme.html">
 
 <script src="../../../scripts/hiddenscroll.js"></script>
 
@@ -307,6 +308,7 @@
       }
     </style>
     <style include="gr-syntax-theme"></style>
+    <style include="gr-ranged-comment-theme"></style>
     <div id="diffHeader" hidden$="[[_computeDiffHeaderHidden(_diffHeaderItems)]]">
       <template
           is="dom-repeat"