diff --git a/classes/pref_filters.php b/classes/pref_filters.php
index 9b8c295ff..dc1f42410 100644
--- a/classes/pref_filters.php
+++ b/classes/pref_filters.php
@@ -38,7 +38,7 @@ class Pref_Filters extends Protected_Handler {
 
 		print __("Articles matching this filter:");
 
-		print "<div class=\"inactiveFeedHolder\">";
+		print "<div class=\"filterTestHolder\">";
 		print "<table width=\"100%\" cellspacing=\"0\" id=\"prefErrorFeedList\">";
 
 		if ($regexp_valid) {
diff --git a/tt-rss.css b/tt-rss.css
index ff48914c0..30f94d288 100644
--- a/tt-rss.css
+++ b/tt-rss.css
@@ -367,7 +367,7 @@ table.prefFeedList td.feedSelect {
 	text-align : center;
 }
 
-div.prefFeedCatHolder, div.prefFeedOPMLHolder, div.inactiveFeedHolder {
+div.prefFeedCatHolder, div.prefFeedOPMLHolder, div.inactiveFeedHolder, div.filterTestHolder {
 	height : 300px;
 	overflow : auto;
 	border-width : 0px 1px 1px 1px;
@@ -377,7 +377,7 @@ div.prefFeedCatHolder, div.prefFeedOPMLHolder, div.inactiveFeedHolder {
 	background-color : #ecf4ff;
 }
 
-div.prefFeedOPMLHolder {
+div.prefFeedOPMLHolder, div.filterTestHolder {
 	border-width : 1px 1px 1px 1px;
 }