diff --git a/lib/bitstamp/transactions.rb b/lib/bitstamp/transactions.rb
index 3d07a4b..6c563db 100644
--- a/lib/bitstamp/transactions.rb
+++ b/lib/bitstamp/transactions.rb
@@ -22,6 +22,6 @@ def update(options={})
   end
 
   class UserTransaction < Bitstamp::Model
-    attr_accessor :datetime, :id, :type, :usd, :btc, :fee, :order_id
+    attr_accessor :datetime, :id, :type, :usd, :btc, :fee, :order_id, :btc_usd
   end
 end