diff --git a/lib/stripe/subscriptions/discount.ex b/lib/stripe/subscriptions/discount.ex
index 030d33c2..1a785141 100644
--- a/lib/stripe/subscriptions/discount.ex
+++ b/lib/stripe/subscriptions/discount.ex
@@ -14,7 +14,8 @@ defmodule Stripe.Discount do
           deleted: boolean | nil,
           end: Stripe.timestamp() | nil,
           start: Stripe.timestamp(),
-          subscription: Stripe.id() | nil
+          subscription: Stripe.id() | nil,
+          promotion_code: Stripe.id() | nil
         }
 
   defstruct [
@@ -24,6 +25,7 @@ defmodule Stripe.Discount do
     :deleted,
     :end,
     :start,
-    :subscription
+    :subscription,
+    :promotion_code
   ]
 end
diff --git a/test/fixtures/discount.json b/test/fixtures/discount.json
index ea26d382..8e0a6cac 100644
--- a/test/fixtures/discount.json
+++ b/test/fixtures/discount.json
@@ -19,5 +19,6 @@
   "customer": "cus_DCUJlLSyrGaqab",
   "end": 1595517288,
   "start": 1532358888,
-  "subscription": "sub_DG9Uq9WOevR9Uo"
+  "subscription": "sub_DG9Uq9WOevR9Uo",
+  "promotion_code": "promo_1HuRNuKKEsQW5O8UAfIZ33ox"
 }
diff --git a/test/stripe/converter_test.exs b/test/stripe/converter_test.exs
index bb8d526a..e0e577d3 100644
--- a/test/stripe/converter_test.exs
+++ b/test/stripe/converter_test.exs
@@ -228,7 +228,8 @@ defmodule Stripe.ConverterTest do
       end: 1_595_517_288,
       object: "discount",
       start: 1_532_358_888,
-      subscription: "sub_DG9Uq9WOevR9Uo"
+      subscription: "sub_DG9Uq9WOevR9Uo",
+      promotion_code: "promo_1HuRNuKKEsQW5O8UAfIZ33ox"
     }
 
     fixture = Helper.load_fixture("discount.json")