diff --git a/client/nuxt.config.js b/client/nuxt.config.js
index bb595477..4df6246f 100644
--- a/client/nuxt.config.js
+++ b/client/nuxt.config.js
@@ -1,6 +1,6 @@
 const pkg = require('./package.json')
 
-const routerBasePath = process.env.ROUTER_BASE_PATH || '/audiobookshelf'
+const routerBasePath = process.env.ROUTER_BASE_PATH ?? '/audiobookshelf'
 const serverHostUrl = process.env.NODE_ENV === 'production' ? '' : 'http://localhost:3333'
 const serverPaths = ['api/', 'public/', 'hls/', 'auth/', 'feed/', 'status', 'login', 'logout', 'init']
 const proxy = Object.fromEntries(serverPaths.map((path) => [`${routerBasePath}/${path}`, { target: process.env.NODE_ENV !== 'production' ? serverHostUrl : '/' }]))
diff --git a/index.js b/index.js
index 35dcc588..fea9a590 100644
--- a/index.js
+++ b/index.js
@@ -29,7 +29,7 @@ if (isDev) {
   if (devEnv.AllowIframe) process.env.ALLOW_IFRAME = '1'
   if (devEnv.BackupPath) process.env.BACKUP_PATH = devEnv.BackupPath
   process.env.SOURCE = 'local'
-  process.env.ROUTER_BASE_PATH = devEnv.RouterBasePath || ''
+  process.env.ROUTER_BASE_PATH = devEnv.RouterBasePath ?? ''
 }
 
 const inputConfig = options.config ? Path.resolve(options.config) : null
@@ -41,7 +41,7 @@ const CONFIG_PATH = inputConfig || process.env.CONFIG_PATH || Path.resolve('conf
 const METADATA_PATH = inputMetadata || process.env.METADATA_PATH || Path.resolve('metadata')
 const SOURCE = options.source || process.env.SOURCE || 'debian'
 
-const ROUTER_BASE_PATH = process.env.ROUTER_BASE_PATH || '/audiobookshelf'
+const ROUTER_BASE_PATH = process.env.ROUTER_BASE_PATH ?? '/audiobookshelf'
 
 console.log(`Running in ${process.env.NODE_ENV} mode.`)
 console.log(`Options: CONFIG_PATH=${CONFIG_PATH}, METADATA_PATH=${METADATA_PATH}, PORT=${PORT}, HOST=${HOST}, SOURCE=${SOURCE}, ROUTER_BASE_PATH=${ROUTER_BASE_PATH}`)
diff --git a/prod.js b/prod.js
index 24a0c3f7..b0f53719 100644
--- a/prod.js
+++ b/prod.js
@@ -25,7 +25,7 @@ const CONFIG_PATH = inputConfig || process.env.CONFIG_PATH || Path.resolve('conf
 const METADATA_PATH = inputMetadata || process.env.METADATA_PATH || Path.resolve('metadata')
 const SOURCE = options.source || process.env.SOURCE || 'debian'
 
-const ROUTER_BASE_PATH = process.env.ROUTER_BASE_PATH || '/audiobookshelf'
+const ROUTER_BASE_PATH = process.env.ROUTER_BASE_PATH ?? '/audiobookshelf'
 
 console.log(process.env.NODE_ENV, 'Config', CONFIG_PATH, METADATA_PATH)