diff --git a/scripts/install b/scripts/install
index 95be1b2..d7e5f5f 100644
--- a/scripts/install
+++ b/scripts/install
@@ -64,7 +64,7 @@ ynh_app_setting_set $app final_path $final_path
 pushd /opt
 curl -sL https://deb.nodesource.com/setup_4.x | sudo bash -
 sudo apt-get -y install nodejs
-npm install -g yarn
+sudo npm install -g yarn
 
 ## Install postgresql database
 dbname=$app