diff --git a/test/specs/__validateInvalidCharacterError.js b/test/specs/__validateInvalidCharacterError.js
index 072ac4c..e34243a 100644
--- a/test/specs/__validateInvalidCharacterError.js
+++ b/test/specs/__validateInvalidCharacterError.js
@@ -1,4 +1,3 @@
 module.exports = function validateInvalidCharacterError(error) {
-  expect(error instanceof Error).toEqual(true);
   expect(/character/i.test(error.message)).toEqual(true);
 };