diff --git a/scripts/upgrade b/scripts/upgrade
index 4e433ac..06f6d6b 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -22,6 +22,22 @@ db_name=$(ynh_app_setting_get $app db_name)
 with_carddav=$(ynh_app_setting_get $app with_carddav)
 with_enigma=$(ynh_app_setting_get $app with_enigma)
 
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+
+# If db_name doesn't exist, create it
+if [ -z $db_name ]; then
+	db_name=$(ynh_sanitize_dbid $app)
+	ynh_app_setting_set $app db_name $db_name
+fi
+
+# If final_path doesn't exist, create it
+if [ -z $final_path ]; then
+	final_path=/var/www/$app
+	ynh_app_setting_set $app final_path $final_path
+fi
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================