1 files changed, 1 insertions, 0 deletions
diff --git a/packages/subproviders/test/unit/private_key_wallet_subprovider_test.ts b/packages/subproviders/test/unit/private_key_wallet_subprovider_test.ts
index 5c1b5cd25..864f977ea 100644
--- a/packages/subproviders/test/unit/private_key_wallet_subprovider_test.ts
+++ b/packages/subproviders/test/unit/private_key_wallet_subprovider_test.ts
@@ -2,6 +2,7 @@ import { JSONRPCResponsePayload } from '@0xproject/types';
 import * as chai from 'chai';
 import * as ethUtils from 'ethereumjs-util';
 import * as _ from 'lodash';
+import 'make-promises-safe';
 import Web3ProviderEngine = require('web3-provider-engine');
 
 import { GanacheSubprovider, PrivateKeyWalletSubprovider } from '../../src/';