diff --git a/reviewboard/htdocs/media/rb/js/diffviewer.js b/reviewboard/htdocs/media/rb/js/diffviewer.js
--- a/reviewboard/htdocs/media/rb/js/diffviewer.js
+++ b/reviewboard/htdocs/media/rb/js/diffviewer.js
@@ -1325,7 +1325,7 @@ function toggleExtraWhitespace(init)
     }
 
     /* Toggle highlighting */
-    $("table.sidebyside .ew").toggleClass("ewhl");
+    $("#diffs").toggleClass("ewhl");
 
     /* Toggle the display of the button itself */
     $(".review-request ul.controls li.ew").toggle();
diff --git a/reviewboard/templates/diffviewer/view_diff.html b/reviewboard/templates/diffviewer/view_diff.html
--- a/reviewboard/templates/diffviewer/view_diff.html
+++ b/reviewboard/templates/diffviewer/view_diff.html
@@ -23,7 +23,7 @@
 <link rel="stylesheet" type="text/css" href="{{MEDIA_URL}}rb/css/syntax.css?{{MEDIA_SERIAL}}" />
 {% if siteconfig.settings.diffviewer_show_trailing_whitespace|default_if_none:1 %}
 <style type="text/css">
-  .ewhl { background: #ee3434; }
+  #diffs.ewhl table.sidebyside .ew { background: #ee3434; }
 </style>
 {% endif %}
 {% endblock %}