1 files changed, 1 insertions, 5 deletions
diff --git a/packages/web3-wrapper/src/utils.ts b/packages/web3-wrapper/src/utils.ts
index 1b67518b1..1aba3c75a 100644
--- a/packages/web3-wrapper/src/utils.ts
+++ b/packages/web3-wrapper/src/utils.ts
@@ -2,10 +2,6 @@ import { BigNumber } from '@0x/utils';
 import * as _ from 'lodash';
 
 export const utils = {
-    isBigNumber(value: any): boolean {
-        const isBigNumber = _.isObject(value) && value.isBigNumber;
-        return isBigNumber;
-    },
     convertHexToNumber(value: string): number {
         const valueBigNumber = new BigNumber(value);
         const valueNumber = valueBigNumber.toNumber();
@@ -20,7 +16,7 @@ export const utils = {
     },
     convertAmountToBigNumber(value: string | number | BigNumber): BigNumber {
         const num = value || 0;
-        const isBigNumber = utils.isBigNumber(num);
+        const isBigNumber = BigNumber.isBigNumber(num);
         if (isBigNumber) {
             return num as BigNumber;
         }