diff --git a/scripts/upgrade b/scripts/upgrade
index 90107e0..bd4c7aa 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -227,9 +227,20 @@ chown -R $app: $final_path
 #=================================================
 ynh_print_info --message="Upgrading SSOwat configuration..."
 
-ynh_permission_create --permission="teamlead"
-ynh_permission_create --permission="admin"
-ynh_permission_create --permission="super_admin" --allowed "$admin"
+if ! ynh_permission_exists --permission="teamlead"
+then
+	ynh_permission_create --permission="teamlead"
+fi
+
+if ! ynh_permission_exists --permission="admin"
+then
+	ynh_permission_create --permission="admin"
+fi
+
+if ! ynh_permission_exists --permission="super_admin"
+then
+	ynh_permission_create --permission="super_admin" --allowed "$admin"
+fi
 
 # Make app public if necessary
 if [ $is_public -eq 1 ]