diff --git a/koha-tmpl/intranet-tmpl/prog/js/categories.js b/koha-tmpl/intranet-tmpl/prog/js/categories.js
index 0746ec79f2..2751afdd53 100644
--- a/koha-tmpl/intranet-tmpl/prog/js/categories.js
+++ b/koha-tmpl/intranet-tmpl/prog/js/categories.js
@@ -60,7 +60,8 @@ $(document).ready(function() {
                     return $("#enrolmentperioddate").val() === "";
                 },
                 digits: true,
-                enrollment_period: true
+                enrollment_period: true,
+                min: 1
             },
             enrolmentperioddate: {
                 required: function(element){