diff --git a/app/code/Magento/Ui/view/base/web/js/lib/validation/rules.js b/app/code/Magento/Ui/view/base/web/js/lib/validation/rules.js
index 041b6eb3b48c1..eea199176681c 100644
--- a/app/code/Magento/Ui/view/base/web/js/lib/validation/rules.js
+++ b/app/code/Magento/Ui/view/base/web/js/lib/validation/rules.js
@@ -224,7 +224,7 @@ define([
         ],
         'time12h': [
             function (value) {
-                return utils.isEmpty(value) || /^((0?[1-9]|1[012])(:[0-5]\d){0,2}(\ [AP]M))$/i.test(value);
+                return utils.isEmpty(value) || /^((0?[1-9]|1[012])(:[0-5]\d){0,2}(\s[AP]M))$/i.test(value);
             },
             $.mage.__('Please enter a valid time, between 00:00 am and 12:00 pm')
         ],