diff --git a/src/sections/codec.ts b/src/sections/codec.ts
index 768c8a00..ca9417a3 100644
--- a/src/sections/codec.ts
+++ b/src/sections/codec.ts
@@ -4,6 +4,7 @@ import { Codec, number, optional, string } from 'purify-ts'
  * Shared codecs
  */
 
+// This is different from the CurrencyAmount used by merchant-fulfillment
 export const CurrencyAmount = Codec.interface({
   CurrencyCode: optional(string),
   CurrencyAmount: optional(number),
diff --git a/src/sections/merchant-fulfillment/codec.ts b/src/sections/merchant-fulfillment/codec.ts
index 5de038a5..09c2c021 100644
--- a/src/sections/merchant-fulfillment/codec.ts
+++ b/src/sections/merchant-fulfillment/codec.ts
@@ -1,13 +1,17 @@
 import { boolean, Codec, enumeration, GetInterface, number, optional, string } from 'purify-ts'
 
 import { ensureArray, ensureString, mwsDate } from '../../parsing'
-import { CurrencyAmount } from '../codec'
 import { PredefinedPackageDimensionsEnum } from './type'
 
 export const TemporarilyUnavailableCarrier = Codec.interface({
   CarrierName: string,
 })
 
+export const CurrencyAmount = Codec.interface({
+  CurrencyCode: string,
+  Amount: number,
+})
+
 export const RejectedShippingService = Codec.interface({
   CarrierName: string,
   ShippingServiceId: ensureString,