diff --git a/scripts/upgrade b/scripts/upgrade
index 9305967..4d67b12 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -24,6 +24,32 @@ ynh_script_progression --message="Stopping a systemd service..." --weight=42
 
 ynh_systemd_action --service_name=$app --action=stop --log_path="systemd"
 
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+ynh_script_progression --message="Ensuring downward compatibility..." --weight=2
+
+if [ -z "${language:-}" ]; then
+    # If upgrading from a version which doesn't support translations, set language to English by default
+    language=en
+    ynh_app_setting_set --app=$app --key=language --value=$language
+fi
+
+if [ -z "${export:-}" ]; then
+	export=none
+	ynh_app_setting_set --app=$app --key=export --value=$export
+fi
+
+if [ -z "${path:-}" ]; then
+	path="/"
+	ynh_app_setting_set --app=$app --key=path --value=$path
+fi
+
+if [ -z "${password:-}" ]; then
+	password=$(ynh_string_random --length=32)
+	ynh_app_setting_set --app=$app --key=password --value="$password"
+fi
+
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================