diff --git a/docs/index.md b/docs/index.md
index ee620776..ec7c3580 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -378,7 +378,9 @@ orderSequence | [sequence](#account-sequence-number) | The [account sequence num
 
 
 ```json
-23
+{
+  "orderSequence": 23
+}
 ```
 
 
@@ -2904,7 +2906,7 @@ Prepare an order cancellation transaction. The prepared transaction must subsequ
 Name | Type | Description
 ---- | ---- | -----------
 address | [address](#ripple-address) | The address of the account that is creating the transaction.
-sequence | [sequence](#account-sequence-number) | The account sequence number of the transaction that created the order to cancel.
+orderCancellation | [orderCancellation](#order-cancellation) | The specification of the order cancellation to prepare.
 instructions | [instructions](#transaction-instructions) | *Optional* Instructions for executing the transaction
 
 ### Return Value
@@ -2927,7 +2929,7 @@ instructions | object | The instructions for how to execute the transaction afte
 
 ```javascript
 const address = 'r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59';
-const sequence = 123;
+const orderCancellation = {orderSequence: 123};
 return api.prepareOrderCancellation(address, sequence)
   .then(prepared => {/* ... */});
 ```
diff --git a/docs/src/prepareOrderCancellation.md.ejs b/docs/src/prepareOrderCancellation.md.ejs
index 682e3ac1..53464fdf 100644
--- a/docs/src/prepareOrderCancellation.md.ejs
+++ b/docs/src/prepareOrderCancellation.md.ejs
@@ -22,7 +22,7 @@ All "prepare" methods have the same return type.
 
 ```javascript
 const address = 'r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59';
-const sequence = 123;
+const orderCancellation = {orderSequence: 123};
 return api.prepareOrderCancellation(address, sequence)
   .then(prepared => {/* ... */});
 ```
diff --git a/src/common/schemas/input/prepare-order-cancellation.json b/src/common/schemas/input/prepare-order-cancellation.json
index 14636db8..4281b74a 100644
--- a/src/common/schemas/input/prepare-order-cancellation.json
+++ b/src/common/schemas/input/prepare-order-cancellation.json
@@ -7,12 +7,12 @@
       "$ref": "address",
       "description": "The address of the account that is creating the transaction."
     },
-    "sequence": {
-      "$ref": "sequence",
-      "description": "The account sequence number of the transaction that created the order to cancel."
+    "orderCancellation": {
+      "$ref": "orderCancellation",
+      "description": "The specification of the order cancellation to prepare."
     },
     "instructions": {"$ref": "instructions"}
   },
   "additionalProperties": false,
-  "required": ["address", "sequence"]
+  "required": ["address", "orderCancellation"]
 }
diff --git a/src/transaction/ordercancellation.js b/src/transaction/ordercancellation.js
index a59c463a..6736fd37 100644
--- a/src/transaction/ordercancellation.js
+++ b/src/transaction/ordercancellation.js
@@ -5,20 +5,20 @@ const validate = utils.common.validate;
 import type {Instructions, Prepare} from './types.js';
 
 function createOrderCancellationTransaction(account: string,
-    sequence: number
+    orderCancellation: Object
 ): Object {
   return {
     TransactionType: 'OfferCancel',
     Account: account,
-    OfferSequence: sequence
+    OfferSequence: orderCancellation.orderSequence
   };
 }
 
-function prepareOrderCancellation(address: string, sequence: number,
+function prepareOrderCancellation(address: string, orderCancellation: Object,
   instructions: Instructions = {}
 ): Promise<Prepare> {
-  validate.prepareOrderCancellation({address, sequence, instructions});
-  const txJSON = createOrderCancellationTransaction(address, sequence);
+  validate.prepareOrderCancellation({address, orderCancellation, instructions});
+  const txJSON = createOrderCancellationTransaction(address, orderCancellation);
   return utils.prepareTransaction(txJSON, this, instructions);
 }
 
diff --git a/test/fixtures/requests/prepare-order-cancellation.json b/test/fixtures/requests/prepare-order-cancellation.json
index 40994076..348829dd 100644
--- a/test/fixtures/requests/prepare-order-cancellation.json
+++ b/test/fixtures/requests/prepare-order-cancellation.json
@@ -1 +1,3 @@
-23
+{
+  "orderSequence": 23
+}
diff --git a/test/integration/integration-test.js b/test/integration/integration-test.js
index 35cf45a7..2e3c0686 100644
--- a/test/integration/integration-test.js
+++ b/test/integration/integration-test.js
@@ -156,9 +156,9 @@ describe('integration tests', function() {
             return txData;
           });
         }).then(txData => this.api.prepareOrderCancellation(
-            address, txData.Sequence, instructions).then(prepared =>
-              testTransaction(this, 'orderCancellation', ledgerVersion,
-                              prepared))
+            address, {orderSequence: txData.Sequence}, instructions)
+            .then(prepared => testTransaction(this, 'orderCancellation',
+              ledgerVersion, prepared))
         );
     });
   });