diff --git a/app/Data/EventDataTransformer.php b/app/Data/EventDataTransformer.php
index 668fc0dd..094499b5 100644
--- a/app/Data/EventDataTransformer.php
+++ b/app/Data/EventDataTransformer.php
@@ -13,7 +13,7 @@
 
 // Coerces the config expression into a constant so that it can
 // be used in attributes.
-define('EVENTS_TIMEZONE', config('app.timezone'));
+define(__NAMESPACE__ . '\EVENTS_TIMEZONE', config('app.timezone'));
 
 class EventDataTransformer extends Data
 {