diff --git a/app/models/expense.rb b/app/models/expense.rb
index 48febb8..b40b49d 100644
--- a/app/models/expense.rb
+++ b/app/models/expense.rb
@@ -3,7 +3,7 @@ class Expense < ApplicationRecord
     monthly: 12,
     annually: 1,
     weekly: 52,
-    quarterly: 3,
+    quarterly: 4,
   }.freeze
   enum :period, PERIOD_OCCURENCES.keys