diff --git a/src/config.js b/src/config.js
index 33ff7832..a8fe2c38 100644
--- a/src/config.js
+++ b/src/config.js
@@ -3,15 +3,15 @@
 const { release } = require('./package.json');
 
 module.exports.RELEASE = release;
-module.exports.PORT = process.env.PORT || 51821;
+module.exports.PORT = process.env.PORT || '51821';
 module.exports.WEBUI_HOST = process.env.WEBUI_HOST || '0.0.0.0';
 module.exports.PASSWORD = process.env.PASSWORD;
 module.exports.WG_PATH = process.env.WG_PATH || '/etc/wireguard/';
 module.exports.WG_DEVICE = process.env.WG_DEVICE || 'eth0';
 module.exports.WG_HOST = process.env.WG_HOST;
-module.exports.WG_PORT = process.env.WG_PORT || 51820;
+module.exports.WG_PORT = process.env.WG_PORT || '51820';
 module.exports.WG_MTU = process.env.WG_MTU || null;
-module.exports.WG_PERSISTENT_KEEPALIVE = process.env.WG_PERSISTENT_KEEPALIVE || 0;
+module.exports.WG_PERSISTENT_KEEPALIVE = process.env.WG_PERSISTENT_KEEPALIVE || '0';
 module.exports.WG_DEFAULT_ADDRESS = process.env.WG_DEFAULT_ADDRESS || '10.8.0.x';
 module.exports.WG_DEFAULT_DNS = typeof process.env.WG_DEFAULT_DNS === 'string'
   ? process.env.WG_DEFAULT_DNS