diff --git a/classes/pref/filters.php b/classes/pref/filters.php
index c91b190ac..13b80ac4b 100644
--- a/classes/pref/filters.php
+++ b/classes/pref/filters.php
@@ -740,7 +740,7 @@ class Pref_Filters extends Handler_Protected {
 
 		print "<input dojoType=\"dijit.form.ValidationTextBox\"
 			 required=\"true\" id=\"filterDlg_regExp\"
-			 style=\"font-size : 16px\"
+			 style=\"font-size : 16px; width : 20em;\"
 			 name=\"reg_exp\" value=\"$reg_exp\"/>";
 
 		print "<hr/>" .  __("on field") . " ";