diff --git a/client-webserver/client.py b/client-webserver/client.py
index eb4d9cfc5..5aff16ddb 100755
--- a/client-webserver/client.py
+++ b/client-webserver/client.py
@@ -157,6 +157,7 @@ def authenticate():
     Main call to do DV_SNI validation and deploy the trustify certificate
     TODO: This should be turned into a class...
     """
+    global server
     assert server or "CHOCOLATESERVER" in os.environ, "Must specify server via command line or CHOCOLATESERVER environment variable."
     if "CHOCOLATESERVER" in os.environ:
         server = os.environ["CHOCOLATESERVER"]