diff --git a/backend/model/reftracker_mapper.rb b/backend/model/reftracker_mapper.rb
index c07b5bf..e538168 100644
--- a/backend/model/reftracker_mapper.rb
+++ b/backend/model/reftracker_mapper.rb
@@ -1,4 +1,4 @@
-require 'Date'
+require 'date'
 
 class RefTrackerMapper