diff --git a/packages/json-schemas/schemas/zero_ex_transaction_schema.json b/packages/json-schemas/schemas/zero_ex_transaction_schema.json
index 240e02ab7e..9d470b1244 100644
--- a/packages/json-schemas/schemas/zero_ex_transaction_schema.json
+++ b/packages/json-schemas/schemas/zero_ex_transaction_schema.json
@@ -5,8 +5,9 @@
         "signerAddress": { "$ref": "/addressSchema" },
         "salt": { "$ref": "/wholeNumberSchema" },
         "expirationTimeSeconds": { "$ref": "/wholeNumberSchema" },
+        "gasPrice": { "$ref": "/wholeNumberSchema" },
         "domain": { "$ref": "/eip712DomainSchema" }
     },
-    "required": ["data", "salt", "expirationTimeSeconds", "signerAddress", "domain"],
+    "required": ["data", "salt", "expirationTimeSeconds", "gasPrice", "signerAddress", "domain"],
     "type": "object"
 }