diff --git a/source/ubl-settings-usergroups.c b/source/ubl-settings-usergroups.c
index d6fc496..d4803d2 100644
--- a/source/ubl-settings-usergroups.c
+++ b/source/ubl-settings-usergroups.c
@@ -1480,6 +1480,7 @@ ubl_settings_usergroups_group_creation_window *yon_ubl_settings_usergroups_group
 	g_signal_connect(G_OBJECT(window->userUIDAutoCheck),"toggled",G_CALLBACK(yon_gtk_widget_set_sensitive_from_toggle_button_inversed),window->UnuniqueGIDCheck);
 	g_signal_connect(G_OBJECT(window->UnuniqueGIDCheck),"toggled",G_CALLBACK(on_system_parameter_changed),window);
 	g_signal_connect(G_OBJECT(window->SystemGroupCheck),"toggled",G_CALLBACK(on_system_parameter_changed),window);
+	g_signal_connect(G_OBJECT(window->userUIDEntry),"insert-text",G_CALLBACK(yon_on_text_insert_only_digits),NULL);
 return window;
 }
 
@@ -2445,6 +2446,7 @@ ubl_settings_usergroups_user_window *yon_ubl_settings_usergroups_user_new(){
 	g_signal_connect(G_OBJECT(window->userGroupsCheck),"toggled",G_CALLBACK(on_parameter_changed),window);
 	g_signal_connect(G_OBJECT(window->userGroupsEntry),"changed",G_CALLBACK(on_parameter_changed),window);
 	g_signal_connect(G_OBJECT(window->userPasswordExpirationEntry),"icon-press",G_CALLBACK(on_remove_expired),window->userPasswordExpirationEntry);
+	g_signal_connect(G_OBJECT(window->userUIDEntry),"insert-text",G_CALLBACK(yon_on_text_insert_only_digits),NULL);
 return window;
 }