diff --git a/src/App.tsx b/src/App.tsx
index 085db9c..335f93e 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -26,7 +26,7 @@ const WIZARD_PORT = Number(import.meta.env.VITE_WIZARD_PORT) || 18080
 const WIZARD_BASE = `http://127.0.0.1:${WIZARD_PORT}`
 
 const getApiBase = () => {
-  return localStorage.getItem('HF_BACKEND_BASE_URL')
+  return localStorage.getItem('HF_BACKEND_BASE_URL') ?? undefined
 }
 
 type AppState = 'checking' | 'setup' | 'ready'
diff --git a/src/services/api.ts b/src/services/api.ts
index 5bee417..477bd30 100644
--- a/src/services/api.ts
+++ b/src/services/api.ts
@@ -1,7 +1,7 @@
 import axios from 'axios'
 
-const getApiBase = () => {
-  return localStorage.getItem('HF_BACKEND_BASE_URL')
+const getApiBase = (): string | undefined => {
+  return localStorage.getItem('HF_BACKEND_BASE_URL') ?? undefined
 }
 
 const api = axios.create({