diff --git a/scripts/upgrade b/scripts/upgrade
index 2736172..873d568 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -55,6 +55,11 @@ fi
 
 url_path=$(ynh_app_setting_get --app="$app" --key=url_path)
 
+if [ -z "$url_path" ]; then
+	url_path=${path#/}
+	ynh_app_setting_set --app="$app" --key=url_path --value="$url_path"
+fi
+
 ynh_add_config --template="../conf/appsettings.json.example" --destination="$install_dir/config/appsettings.json"
 
 chmod 600 "$install_dir/config/appsettings.json"