diff --git a/api/routes/oauth/common.ts b/api/routes/oauth/common.ts
index 8894e5a..f998e1c 100644
--- a/api/routes/oauth/common.ts
+++ b/api/routes/oauth/common.ts
@@ -23,10 +23,10 @@ export function mount(app: Router) {
       Object.fromEntries(ctx.url.searchParams.entries())
     )
 
-    const origin = (
+    const { origin } = new URL((
       ctx.request.headers.get('referer') ??
       env.WEB_URL
-    ).replace(/\/$/, '')
+    ))
 
     ctx.log('OAuth origin:', origin)
 
diff --git a/src/pages/App.tsx b/src/pages/App.tsx
index 4456dec..eea507e 100644
--- a/src/pages/App.tsx
+++ b/src/pages/App.tsx
@@ -44,7 +44,6 @@ export function App() {
         case '/oauth/popup': {
           const provider = state.url.searchParams.get('provider')!
           const url = new URL(`${env.VITE_API_URL}/oauth/start`)
-          url.searchParams.set('origin', location.origin)
           url.searchParams.set('provider', provider)
           location.href = url.href
           return <div />