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-rw-r--r--src/contract_wrappers/exchange_wrapper.ts2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 1a675ee8e..690f90360 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -234,7 +234,7 @@ export class ExchangeWrapper extends ContractWrapper {
orders: Array<Order|SignedOrder>, takerTokenCancelAmounts: BigNumber.BigNumber[]): Promise<void> {
const makers = _.map(orders, order => order.maker);
assert.isSameLength('orders', orders, 'takerTokenCancelAmounts', takerTokenCancelAmounts);
- assert.assert(_.isEmpty(orders), 'Can not cancel an empty batch');
+ assert.assert(!_.isEmpty(orders), 'Can not cancel an empty batch');
assert.assert(_.uniq(makers).length === 1, 'Can not cancel orders from multiple makers in a single batch');
const maker = makers[0];
// _.zip doesn't type check if values have different types :'(