diff --git a/backend/tabby/settings.py b/backend/tabby/settings.py
index 3c14895..36bd608 100644
--- a/backend/tabby/settings.py
+++ b/backend/tabby/settings.py
@@ -239,7 +239,7 @@ if FRONTEND_URL:
     CSRF_TRUSTED_ORIGINS = [frontend_domain]
     if BACKEND_URL:
         CSRF_TRUSTED_ORIGINS.append(urlparse(BACKEND_URL).hostname)
-    SESSION_COOKIE_DOMAIN = frontend_domain
+    SESSION_COOKIE_DOMAIN = os.getenv('SESSION_COOKIE_DOMAIN', frontend_domain)
     SESSION_COOKIE_SAMESITE = None
     CSRF_COOKIE_DOMAIN = frontend_domain