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-rw-r--r--packages/0x.js/src/0x.ts2
1 files changed, 1 insertions, 1 deletions
diff --git a/packages/0x.js/src/0x.ts b/packages/0x.js/src/0x.ts
index 7393cc814..596d6ffba 100644
--- a/packages/0x.js/src/0x.ts
+++ b/packages/0x.js/src/0x.ts
@@ -128,7 +128,7 @@ export class ZeroEx {
* @return The amount in units.
*/
public static toUnitAmount(amount: BigNumber, decimals: number): BigNumber {
- assert.isBigNumber('amount', amount);
+ assert.isValidBaseUnitAmount('amount', amount);
assert.isNumber('decimals', decimals);
const aUnit = new BigNumber(10).pow(decimals);