diff --git a/calsocial/__init__.py b/calsocial/__init__.py
index 8ceb9bd..bab8a8d 100644
--- a/calsocial/__init__.py
+++ b/calsocial/__init__.py
@@ -124,7 +124,7 @@ class CalendarSocialApp(Flask):
             return utc
 
         if not self._timezone:
-            timezone_str = current_app.settings.get('DEFAULT_TIMEZONE', 'UTC')
+            timezone_str = current_app.config.get('DEFAULT_TIMEZONE', 'UTC')
 
             try:
                 self._timezone = timezone(timezone_str)