diff --git a/test/parallel/test-util-promisify.js b/test/parallel/test-util-promisify.js
index 656d6d60aa8f13..ed1f94f1a5e38b 100644
--- a/test/parallel/test-util-promisify.js
+++ b/test/parallel/test-util-promisify.js
@@ -34,6 +34,20 @@ const stat = promisify(fs.stat);
   assert.strictEqual(promisify(promisify(fn)), promisifedFn);
 }
 
+{
+  common.expectsError(
+    () => promisify(undefined),
+    { code: 'ERR_INVALID_ARG_TYPE', type: TypeError }
+  );
+}
+
+{
+  common.expectsError(
+    () => promisify(null),
+    { code: 'ERR_INVALID_ARG_TYPE', type: TypeError }
+  );
+}
+
 {
   function fn() {}
   fn[promisify.custom] = 42;