diff --git a/scripts/upgrade b/scripts/upgrade
index e460679..ff66ce3 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -72,9 +72,9 @@ then
 	ynh_script_progression --message="Migrating default language variable"
 	if [ "$language" == "fr" ]
 	then
-		$language = "fr_FR"
+		ynh_app_setting_set --app=$app --key=language --value="fr_FR"
 	else
-		$language = "en_US"
+		ynh_app_setting_set --app=$app --key=language --value="en_US"
 	fi
 else
 	ynh_script_progression --message="No default language migration to be done"