diff --git a/scripts/install b/scripts/install
index 876eb60..4599d3a 100644
--- a/scripts/install
+++ b/scripts/install
@@ -170,20 +170,20 @@ ynh_system_user_create $app $final_path
 # ...
 #=================================================
 
+chown -R $app: $final_path
+
 mkdir -p /var/log/$app
 chown -R $app:$app /var/log/$app
 
 pushd $final_path
 ynh_use_nodejs
-npm install hoek@^4.2.1 --save
-npm install
-npm audit fix
-npm install typescript@>=2.0 --save
-npm install ts-node
+sudo -u $app env PATH=$PATH:$nodejs_path npm install hoek@^4.2.1 --save
+sudo -u $app env PATH=$PATH:$nodejs_path npm install typescript@>=2.0 --save
+sudo -u $app env PATH=$PATH:$nodejs_path npm install ts-node
+sudo -u $app env PATH=$PATH:$nodejs_path npm install
+sudo -u $app env PATH=$PATH:$nodejs_path npm audit fix
 popd
 
-chown -R $app:$app $final_path
-
 #=================================================
 # SETUP SYSTEMD
 #=================================================
@@ -311,4 +311,4 @@ fi
 #=================================================
 
 systemctl reload nginx
-sleep 30
\ No newline at end of file
+sleep 30
diff --git a/scripts/restore b/scripts/restore
index 9b817a4..325054e 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -130,4 +130,4 @@ ynh_restore_file "/etc/logrotate.d/$app"
 
 #systemctl reload php5-fpm
 systemctl reload nginx
-sleep 30
\ No newline at end of file
+sleep 30
diff --git a/scripts/upgrade b/scripts/upgrade
index 4d0575a..7522e2f 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -116,13 +116,15 @@ ynh_system_user_create $app
 # ...
 #=================================================
 
+chown -R $app: $final_path
+
 pushd $final_path
 ynh_use_nodejs
-npm install hoek@^4.2.1 --save
-npm install
-npm audit fix
-npm install typescript@>=2.0 --save
-npm install ts-node
+sudo -u $app env PATH=$PATH:$nodejs_path npm install hoek@^4.2.1 --save
+sudo -u $app env PATH=$PATH:$nodejs_path npm install typescript@>=2.0 --save
+sudo -u $app env PATH=$PATH:$nodejs_path npm install ts-node
+sudo -u $app env PATH=$PATH:$nodejs_path npm install
+sudo -u $app env PATH=$PATH:$nodejs_path npm audit fix
 popd
 
 ### Verify the checksum of a file, stored by `ynh_store_file_checksum` in the install script.
@@ -176,4 +178,4 @@ fi
 #=================================================
 
 systemctl reload nginx
-sleep 10
+sleep 30