diff --git a/scripts/upgrade b/scripts/upgrade
index 416f015..503e60f 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -16,7 +16,7 @@ ynh_script_progression --message="Loading installation settings..."
 
 app=$YNH_APP_INSTANCE_NAME
 
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+final_path=$(ynh_app_setting_get --app="$app" --key=final_path)
 
 #=================================================
 # CHECK VERSION