diff --git a/ubl-settings-usergroups-user.glade b/ubl-settings-usergroups-user.glade
index 2483580..edb5961 100644
--- a/ubl-settings-usergroups-user.glade
+++ b/ubl-settings-usergroups-user.glade
@@ -337,6 +337,7 @@
                                   <object class="GtkEntry" id="userUserNameEntry">
                                     <property name="visible">True</property>
                                     <property name="can-focus">True</property>
+                                    <property name="max-length">32</property>
                                     <property name="placeholder-text" translatable="yes">User name</property>
                                   </object>
                                   <packing>