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 00de03ba69647..23cf080346d5a 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
@@ -194,7 +194,7 @@ define([
         ],
         "time12h": [
             function(value) {
-                return /^((0?[1-9]|1[012])(:[0-5]\d){0,2}(\ [AP]M))$/i.test(value);
+                return /^((0?[1-9]|1[012])(:[0-5]\d){0,2}(\s[AP]M))$/i.test(value);
             },
             $.mage.__('Please enter a valid time, between 00:00 am and 12:00 pm')
         ],