diff --git a/src/commoncomponents/UsernameLineEdit.qml b/src/commoncomponents/UsernameLineEdit.qml
index 86bf4e40d93813fb2e2b4c53691a9901fd29d683..93f66839285b5773fc0c1fa21b1fdb625fc17285 100644
--- a/src/commoncomponents/UsernameLineEdit.qml
+++ b/src/commoncomponents/UsernameLineEdit.qml
@@ -40,6 +40,8 @@ MaterialLineEdit {
     font.pointSize: JamiTheme.usernameLineEditPointSize
     font.kerning: true
 
+    validator: RegularExpressionValidator { regularExpression: /[A-z0-9_]{0,32}/ }
+
     Connections {
         id: registeredNameFoundConnection