diff --git a/scripts/install b/scripts/install
index b324893..df33c1e 100644
--- a/scripts/install
+++ b/scripts/install
@@ -79,7 +79,7 @@ sudo su -c "psql" postgres <<< \
 ynh_psql_create_db_without_password "$app"
 
 # Download all Ruby source
-su - mastodon
+sudo su - mastodon
 sudo git clone https://github.com/rbenv/rbenv.git $final_path/.rbenv
 sudo git clone https://github.com/rbenv/ruby-build.git $final_path/.rbenv/plugins/ruby-build
 sudo git clone https://github.com/tootsuite/mastodon.git $final_path/live