diff --git a/koha-tmpl/intranet-tmpl/prog/en/includes/catalog-strings.inc b/koha-tmpl/intranet-tmpl/prog/en/includes/catalog-strings.inc
index fc88b79abf..c38f8ee8ef 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/includes/catalog-strings.inc
+++ b/koha-tmpl/intranet-tmpl/prog/en/includes/catalog-strings.inc
@@ -2,7 +2,7 @@
 <!-- catalog-strings.inc -->
 <script>
     /* Some required variables from the template */
-    var biblionumber = [% biblionumber | html %];
+    var biblionumber = "[% biblionumber | html %]";
     var count = [% count || 0 | html %];
     var holdcount = [% holdcount || 0 | html %];
     [% SET orders = biblio.orders %]
@@ -11,7 +11,7 @@
     var countorders = [% current.count || 0 | html %];
     var countdeletedorders = [% cancelled.count || 0 | html %];
     var subscriptionscount = [% biblio.subscriptions.count || 0 | html %];
-    var searchid = '[% searchid | html %]';
+    var searchid = "[% searchid | html %]";
 
     /* provide Z3950 search points */
     function GetZ3950Terms(){
diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt
index c56cc3b918..f0aabd56fd 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt
@@ -1826,7 +1826,7 @@
     [% Asset.js("js/place_booking_modal.js") | $raw %]
     <script>
         var browser;
-        browser = KOHA.browser('[% searchid | html %]', parseInt(biblionumber, 10));
+        browser = KOHA.browser("[% searchid | html %]", parseInt(biblionumber, 10));
         browser.show();
 
         [% IF bundlesEnabled %]