1 files changed, 1 insertions, 1 deletions
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index fe0c5bc00..b4bf24846 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -807,7 +807,7 @@ export class ExchangeWrapper extends ContractWrapper {
         if (!_.isUndefined(errLog)) {
             const logArgs = errLog.args;
             const errCode = logArgs.errorId.toNumber();
-            const errMessage = this._exchangeContractErrCodesToMsg[errCode];
+            const errMessage: ExchangeContractErrs = this._exchangeContractErrCodesToMsg[errCode];
             throw new Error(errMessage);
         }
     }