diff --git a/scripts/upgrade b/scripts/upgrade
index f0bfb35..2891db8 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -72,7 +72,7 @@ then
   chown $app:$app "$install_dir/config.local.php"
 fi
 
-if [ ! -f "${data_dir}/data/config.local.user.php" ]; then
+if [ ! -f "$data_dir/data/config.local.user.php" ]; then
 	ynh_script_progression --message="Updating a configuration file..." --weight=5
 
   ynh_add_config --template="config.local.user.php" --destination="$data_dir/config.local.php"