diff --git a/scripts/upgrade b/scripts/upgrade
index a12013b..26e3e1e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -49,6 +49,7 @@ fi
 if [ -z "$language" ]; then
 	language="en"
 	ynh_app_setting_set --app=$app --key=language --value=$language
+	ynh_app_setting_delete --app=$app --key=$lang
 fi
 
 case "$language" in