diff --git a/confidential_backend/config.py b/confidential_backend/config.py
index 94149592..097ef95c 100644
--- a/confidential_backend/config.py
+++ b/confidential_backend/config.py
@@ -14,6 +14,7 @@
 
 SESSION_TYPE = os.getenv("SESSION_TYPE", 'redis')
 SESSION_REDIS = redis.from_url(os.getenv("SESSION_REDIS", "redis://127.0.0.1:6379"))
+SESSION_COOKIE_DOMAIN = os.getenv("SESSION_COOKIE_DOMAIN")
 SESSION_COOKIE_SAMESITE = os.getenv("SESSION_COOKIE_SAMESITE", 'Lax')
 SESSION_COOKIE_SECURE = os.getenv("SESSION_COOKIE_SECURE", 'false').lower() == 'true'