diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/authorities/authorities.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/authorities/authorities.tt
index ba2cb21724..7a7be9c844 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/authorities/authorities.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/authorities/authorities.tt
@@ -52,7 +52,7 @@ function GetZ3950Terms(){
     for(var i=0,len=mandatories.length; i<len ; i++){
         var field_value = document.getElementById(mandatories[i]).value;
         if( field_value ){
-            strQuery += "&"+mandatories_label[i]+"="+field_value;
+            strQuery += "&"+mandatories_label[i]+"="+encodeURIComponent(field_value);
         }
     }
     return strQuery;