1 files changed, 1 insertions, 1 deletions
diff --git a/packages/assert/test/assert_test.ts b/packages/assert/test/assert_test.ts
index 15fd3e6a8..cbbfe39db 100644
--- a/packages/assert/test/assert_test.ts
+++ b/packages/assert/test/assert_test.ts
@@ -49,7 +49,7 @@ describe('Assertions', () => {
     });
     describe('#isFunction', () => {
         it('should not throw for valid input', () => {
-            const validInputs = [BigNumber, assert.isString];
+            const validInputs = [BigNumber, assert.isString.bind(assert)];
             validInputs.forEach(input => expect(assert.isFunction.bind(assert, variableName, input)).to.not.throw());
         });
         it('should throw for invalid input', () => {