1 files changed, 1 insertions, 0 deletions
diff --git a/src/utils/assert.ts b/src/utils/assert.ts
index 94b119d5a..38c1d4aae 100644
--- a/src/utils/assert.ts
+++ b/src/utils/assert.ts
@@ -2,6 +2,7 @@ import * as _ from 'lodash';
 import * as BigNumber from 'bignumber.js';
 import * as Web3 from 'web3';
 import {Web3Wrapper} from '../web3_wrapper';
+import {Schema} from 'jsonschema';
 import {SchemaValidator} from './schema_validator';
 import {utils} from './utils';