diff --git a/contracts/exchange/test/core.ts b/contracts/exchange/test/core.ts
index bee19b1327..1d94bdae09 100644
--- a/contracts/exchange/test/core.ts
+++ b/contracts/exchange/test/core.ts
@@ -56,6 +56,7 @@ const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
 
 // tslint:disable:no-unnecessary-type-assertion
 describe('Exchange core', () => {
+    const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000';
     let chainId: number;
     let makerAddress: string;
     let owner: string;