diff --git a/scripts/install b/scripts/install
index bd2342e..23b594a 100644
--- a/scripts/install
+++ b/scripts/install
@@ -191,7 +191,7 @@ chown -R "$app":"$app" "$final_path"
 pushd $final_path
     ynh_use_nodejs
     #sudo -u $app env PATH=$PATH:$nodejs_path npm install hoek@^4.2.1 --save --production
-    sudo -u $app env PATH=$PATH:$nodejs_path yarn install ts-node --save --production
+    sudo -u $app env PATH=$PATH:$nodejs_path yarn add ts-node --save --production
     sudo -u $app env PATH=$PATH:$nodejs_path yarn install --production
 popd