diff --git a/app/blueprints/users/account.py b/app/blueprints/users/account.py
index e546d48..780a6a7 100644
--- a/app/blueprints/users/account.py
+++ b/app/blueprints/users/account.py
@@ -102,7 +102,7 @@ def logout():
 class RegisterForm(FlaskForm):
 	display_name = StringField("Display Name", [Optional(), Length(1, 20)], filters=[lambda x: nonEmptyOrNone(x)])
 	username = StringField("Username", [InputRequired(),
-			Regexp("^[a-zA-Z0-9._ -]+$", message="Only a-zA-Z0-9._ allowed")])
+			Regexp("^[a-zA-Z0-9._-]+$", message="Only a-zA-Z0-9._ allowed")])
 	email = StringField("Email", [InputRequired(), Email()])
 	password = PasswordField("Password", [InputRequired(), Length(6, 100)])
 	agree = BooleanField("I agree", [Required()])
diff --git a/app/templates/users/register.html b/app/templates/users/register.html
index 78fd967..82657c1 100644
--- a/app/templates/users/register.html
+++ b/app/templates/users/register.html
@@ -13,7 +13,7 @@ Register
 	<form action="" method="POST" class="form card-body" role="form">
 		{{ form.hidden_tag() }}
 
-		{{ render_field(form.username, pattern="[a-zA-Z0-9._ -]+", title=_("Only a-zA-Z0-9._ allowed"),
+		{{ render_field(form.username, pattern="[a-zA-Z0-9._-]+", title=_("Only a-zA-Z0-9._ allowed"),
 				hint=_("Only alphanumeric characters, periods, underscores, and minuses are allowed (a-zA-Z0-9._)")) }}
 
 		{{ render_field(form.display_name,