diff --git a/scripts/upgrade b/scripts/upgrade
index a2c9626..ccee7bb 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -54,7 +54,7 @@ chown -R "$app:www-data" "$install_dir"
 #=================================================
 ynh_script_progression --message="Building app... (this will take some time and resources!)" --weight=20
 
-pushd "$install_dir/build"
+pushd "$install_dir/source"
     ynh_use_nodejs
     ynh_exec_warn_less ynh_exec_as "$app" "$ynh_node_load_PATH" "$ynh_npm" install
     ynh_exec_warn_less env "$ynh_node_load_PATH" "$ynh_npm" install gulp -g