diff --git a/testing/test_mark.py b/testing/test_mark.py
index 67219313183..075018f3e32 100644
--- a/testing/test_mark.py
+++ b/testing/test_mark.py
@@ -1344,3 +1344,11 @@ def test_fixture_disallowed_between_marks() -> None:
         @pytest.mark.usefixtures("tmp_path")
         def foo():
             raise NotImplementedError()
+
+
+def test_marker_rejects_unserializable_argument():
+    with pytest.raises(TypeError):
+
+        @pytest.mark.example(object())
+        def test_func():
+            pass