diff --git a/contracts/coordinator/test/coordinator.ts b/contracts/coordinator/test/coordinator.ts
index d9ed5e49f9..4c8a2b9c16 100644
--- a/contracts/coordinator/test/coordinator.ts
+++ b/contracts/coordinator/test/coordinator.ts
@@ -23,7 +23,7 @@ import {
 } from '@0x/contracts-test-utils';
 import { BlockchainLifecycle } from '@0x/dev-utils';
 import { assetDataUtils, orderHashUtils } from '@0x/order-utils';
-import { RevertReason, SignedOrder } from '@0x/types';
+import { RevertReason } from '@0x/types';
 import { BigNumber, providerUtils } from '@0x/utils';
 import * as chai from 'chai';
 import { LogWithDecodedArgs } from 'ethereum-types';
diff --git a/contracts/exchange/test/transactions.ts b/contracts/exchange/test/transactions.ts
index 630ee11696..ee2a31c127 100644
--- a/contracts/exchange/test/transactions.ts
+++ b/contracts/exchange/test/transactions.ts
@@ -45,7 +45,7 @@ import {
 chaiSetup.configure();
 const expect = chai.expect;
 const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
-
+// tslint:disable:no-unnecessary-type-assertion
 describe('Exchange transactions', () => {
     let chainId: number;
     let senderAddress: string;
@@ -852,7 +852,7 @@ describe('Exchange transactions', () => {
                     transactionHashUtils.getTransactionHashHex(transaction2),
                     nestedError,
                 );
-                expect(tx).to.revertWith(expectedError);
+                return expect(tx).to.revertWith(expectedError);
             });
         });
         describe('examples', () => {