diff --git a/lib/referee.test.js b/lib/referee.test.js
index b9ba4cd8..e163b1d0 100644
--- a/lib/referee.test.js
+++ b/lib/referee.test.js
@@ -102,6 +102,7 @@ describe("API", function() {
         [
             "isMap",
             "isUint8ClampedArray",
+            "isURIError",
             "isWeakMap",
             "isWeakSet",
             "json",