diff --git a/koha-tmpl/intranet-tmpl/prog/en/includes/patron-search.inc b/koha-tmpl/intranet-tmpl/prog/en/includes/patron-search.inc
index f752b88fbd..36e58d10dd 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/includes/patron-search.inc
+++ b/koha-tmpl/intranet-tmpl/prog/en/includes/patron-search.inc
@@ -233,7 +233,7 @@
         }, {});
 
         [% IF Koha.Preference('ExtendedPatronAttributes') %]
-            [% SET extended_attribute_types = ExtendedAttributeTypes.codes( staff_searchable => 1 ) %]
+            [% SET extended_attribute_types = [ ExtendedAttributeTypes.codes( staff_searchable => 1 ) ] %]
             let extended_attribute_types = [% To.json(extended_attribute_types || []) | $raw %];
         [% END %]