diff --git a/lib/transaction.rb b/lib/transaction.rb
index 4dc6c389222e4b26ca1236eb2bf1fdf3256d1e5e..8a16e082341f01ad41edfdbbad648085671a3809 100644
--- a/lib/transaction.rb
+++ b/lib/transaction.rb
@@ -11,7 +11,12 @@ class Transaction
 	def bonus
 		return unless bonus_amount.positive?
 
-		new(@customer_id, "bonus_for_#{@id}", bonus_amount, "#{@note} bonus")
+		self.class.new(
+			@customer_id,
+			"bonus_for_#{@id}",
+			bonus_amount,
+			"#{@note} bonus"
+		)
 	end
 
 	def bonus_amount