diff --git a/print/resources/inkstitch.js b/print/resources/inkstitch.js
index 67690df27..e5065fe6e 100644
--- a/print/resources/inkstitch.js
+++ b/print/resources/inkstitch.js
@@ -295,6 +295,7 @@ $(function() {
     $('.' + field_name).toggle($(this).prop('checked'));
     setPageNumbers();
   }).on('change', function() {
+    var field_name = $(this).attr('data-field-name');
     $.postJSON('/settings/' + field_name, {value: $(this).prop('checked')});
   });