diff --git a/server/app_legacy.py b/server/app_legacy.py
index 1e25390..fcf8d76 100644
--- a/server/app_legacy.py
+++ b/server/app_legacy.py
@@ -254,6 +254,7 @@ if not _secret_key:
 app.config['SECRET_KEY'] = _secret_key
 app.config['PERMANENT_SESSION_LIFETIME'] = timedelta(hours=12)
 _cookie_secure_env = (os.environ.get("WEB_COOKIE_SECURE") or "").strip().lower()
+app.config['SESSION_COOKIE_NAME'] = os.environ.get("WEB_SESSION_COOKIE_NAME", "session")
 app.config['SESSION_COOKIE_SAMESITE'] = os.environ.get("WEB_COOKIE_SAMESITE", "Strict")
 app.config['SESSION_COOKIE_SECURE'] = _cookie_secure_env in {"1", "true", "yes"}
 app.config['SESSION_COOKIE_HTTPONLY'] = True