diff --git a/packages/base-contract/src/index.ts b/packages/base-contract/src/index.ts
index 101228c52c..0238106f32 100644
--- a/packages/base-contract/src/index.ts
+++ b/packages/base-contract/src/index.ts
@@ -1,4 +1,4 @@
-import { AbiEncoder, abiUtils } from '@0x/utils';
+import { AbiEncoder, abiUtils, BigNumber } from '@0x/utils';
 import { Web3Wrapper } from '@0x/web3-wrapper';
 import {
     AbiDefinition,