diff --git a/src/integrations/auth/config.ts b/src/integrations/auth/config.ts
index 204542827..9bb11af10 100644
--- a/src/integrations/auth/config.ts
+++ b/src/integrations/auth/config.ts
@@ -188,6 +188,7 @@ const getAuthConfig = () => {
 				usernameNormalization: (value) => toUsername(value),
 				displayUsernameNormalization: (value) => toUsername(value),
 				validationOrder: { username: "post-normalization", displayUsername: "post-normalization" },
+				usernameValidator:(username)=> /^[a-z0-9._-]+$/.test(username)
 			}),
 			twoFactor({
 				issuer: "Reactive Resume",