diff --git a/ui/src/pages/Users/Settings/Profile/index.tsx b/ui/src/pages/Users/Settings/Profile/index.tsx
index 62bd6fb8e..d695c5530 100644
--- a/ui/src/pages/Users/Settings/Profile/index.tsx
+++ b/ui/src/pages/Users/Settings/Profile/index.tsx
@@ -177,7 +177,7 @@ const Index: React.FC = () => {
         isInvalid: true,
         errorMsg: t('username.msg_range'),
       };
-    } else if (/[^a-z0-9\-._]/.test(username.value)) {
+    } else if (/[^a-z0-9\-._]/i.test(username.value)) {
       bol = false;
       formData.username = {
         value: username.value,