diff --git a/packages/json-schemas/schemas/order_schema.json b/packages/json-schemas/schemas/order_schema.json
index ff693da811..c4cc4d84b2 100644
--- a/packages/json-schemas/schemas/order_schema.json
+++ b/packages/json-schemas/schemas/order_schema.json
@@ -10,6 +10,8 @@
         "takerAssetAmount": { "$ref": "/wholeNumberSchema" },
         "makerAssetData": { "$ref": "/hexSchema" },
         "takerAssetData": { "$ref": "/hexSchema" },
+        "makerFeeAssetData": { "$ref": "/hexSchema" },
+        "takerFeeAssetData": { "$ref": "/hexSchema" },
         "salt": { "$ref": "/wholeNumberSchema" },
         "feeRecipientAddress": { "$ref": "/addressSchema" },
         "expirationTimeSeconds": { "$ref": "/wholeNumberSchema" },
@@ -25,6 +27,8 @@
         "takerAssetAmount",
         "makerAssetData",
         "takerAssetData",
+        "makerFeeAssetData",
+        "takerFeeAssetData",
         "salt",
         "feeRecipientAddress",
         "expirationTimeSeconds",
diff --git a/packages/json-schemas/test/schema_test.ts b/packages/json-schemas/test/schema_test.ts
index bb16f4bbbe..8975c3cfab 100644
--- a/packages/json-schemas/test/schema_test.ts
+++ b/packages/json-schemas/test/schema_test.ts
@@ -214,6 +214,8 @@ describe('Schema', () => {
             takerAssetAmount: '2',
             makerAssetData: NULL_ADDRESS,
             takerAssetData: NULL_ADDRESS,
+            makerFeeAssetData: NULL_ADDRESS,
+            takerFeeAssetData: NULL_ADDRESS,
             salt: '67006738228878699843088602623665307406148487219438534730168799356281242528500',
             feeRecipientAddress: NULL_ADDRESS,
             expirationTimeSeconds: '42',