1 files changed, 11 insertions, 5 deletions
diff --git a/packages/order-watcher/src/utils/assert.ts b/packages/order-watcher/src/utils/assert.ts
index 5d7f72716..a891a60d2 100644
--- a/packages/order-watcher/src/utils/assert.ts
+++ b/packages/order-watcher/src/utils/assert.ts
@@ -1,17 +1,23 @@
 import { assert as sharedAssert } from '@0xproject/assert';
-// We need those two unused imports because they're actually used by sharedAssert which gets injected here
+// HACK: We need those two unused imports because they're actually used by sharedAssert which gets injected here
 // tslint:disable:no-unused-variable
 import { Schema } from '@0xproject/json-schemas';
 import { ECSignature } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 // tslint:enable:no-unused-variable
+import { Provider } from 'ethereum-types';
 
-import { isValidSignature } from '@0xproject/order-utils';
+import { isValidSignatureAsync } from '@0xproject/order-utils';
 
 export const assert = {
     ...sharedAssert,
-    isValidSignature(orderHash: string, ecSignature: ECSignature, signerAddress: string): void {
-        const isValid = isValidSignature(orderHash, ecSignature, signerAddress);
-        this.assert(isValid, `Expected order with hash '${orderHash}' to have a valid signature`);
+    async isValidSignatureAsync(
+        provider: Provider,
+        orderHash: string,
+        signature: string,
+        signerAddress: string,
+    ): Promise<void> {
+        const isValid = await isValidSignatureAsync(provider, orderHash, signature, signerAddress);
+        assert.assert(isValid, `Expected order with hash '${orderHash}' to have a valid signature`);
     },
 };