diff --git a/app.py b/app.py
index a9356e1..91b58f1 100644
--- a/app.py
+++ b/app.py
@@ -13,10 +13,12 @@ GROUP = os.environ.get('GROUP', '1')
 ALLOWED_YEARS = os.environ.get('ALLOWED_YEARS', '3,4,5').split(',')
 ALLOWED_GROUPS = os.environ.get('ALLOWED_GROUPS', '1,2,3').split(',')
 
+BASE_URL = os.environ.get('BASE_URL', None)
+
 
 @app.route("/")
 def hello():
-    url = os.environ.get('URL', None)
+    url = BASE_URL
     if url is None:
         return ""