diff --git a/apps/sim/middleware.ts b/apps/sim/middleware.ts
index 80285b6d14..303eb86a2e 100644
--- a/apps/sim/middleware.ts
+++ b/apps/sim/middleware.ts
@@ -73,7 +73,8 @@ export async function middleware(request: NextRequest) {
   }
 
   // For self-hosted deployments, redirect root path based on session status
-  if (!isHosted && url.pathname === '/') {
+  // Only apply redirects to the main domain, not subdomains
+  if (!isHosted && !isCustomDomain && url.pathname === '/') {
     if (hasActiveSession) {
       // User has active session, redirect to workspace
       return NextResponse.redirect(new URL('/workspace', request.url))