diff --git a/fhem/www/pgm2/fhemweb.js b/fhem/www/pgm2/fhemweb.js
index 706227785..db4e7fd67 100644
--- a/fhem/www/pgm2/fhemweb.js
+++ b/fhem/www/pgm2/fhemweb.js
@@ -295,7 +295,8 @@ FW_jqueryReadyFn()
 
   $("select[id^=sel_attr],select[id^=sel_set],select[id^=sel_get]")
   .change(function(){ // online help
-    var val=$(this).val().replace(/[.\/(){}\[\]*]/g,function(a){return "\\"+a});
+    var val = $(this).val().replace(/[.\/(){}\[\]%*]/g,
+                            function(a){ return "\\"+a });
     var m = $(this).attr("name").match(/arg.(set|get|attr)(.*)/);
     if(!m)
       return;