diff --git a/sphinx/domains/python.py b/sphinx/domains/python.py
index 2dc26a382e1..508f14f0a5f 100644
--- a/sphinx/domains/python.py
+++ b/sphinx/domains/python.py
@@ -271,7 +271,8 @@ def _pseudo_parse_arglist(signode: desc_signature, arglist: str) -> None:
                 ends_open += 1
                 argument = argument[:-1].strip()
             if argument:
-                stack[-1] += addnodes.desc_parameter(argument, argument)
+                stack[-1] += addnodes.desc_parameter(
+                    '', '', addnodes.desc_sig_name(argument, argument))
             while ends_open:
                 stack.append(addnodes.desc_optional())
                 stack[-2] += stack[-1]
diff --git a/tests/test_domain_js.py b/tests/test_domain_js.py
index 4680d88cc7e..434513063d5 100644
--- a/tests/test_domain_js.py
+++ b/tests/test_domain_js.py
@@ -188,8 +188,8 @@ def test_js_function(app):
                           [desc, ([desc_signature, ([desc_name, ([desc_sig_name, "sum"])],
                                                     desc_parameterlist)],
                                   [desc_content, ()])]))
-    assert_node(doctree[1][0][1], [desc_parameterlist, ([desc_parameter, "a"],
-                                                        [desc_parameter, "b"])])
+    assert_node(doctree[1][0][1], [desc_parameterlist, ([desc_parameter, ([desc_sig_name, "a"])],
+                                                        [desc_parameter, ([desc_sig_name, "b"])])])
     assert_node(doctree[0], addnodes.index,
                 entries=[("single", "sum() (built-in function)", "sum", "", None)])
     assert_node(doctree[1], addnodes.desc, domain="js", objtype="function", noindex=False)