diff --git a/PC/_testconsole.c b/PC/_testconsole.c
index 0dcea866f65d35..2538ae3ceba643 100644
--- a/PC/_testconsole.c
+++ b/PC/_testconsole.c
@@ -161,7 +161,7 @@ static PyModuleDef testconsole_def = {
 };
 
 PyMODINIT_FUNC
-PyInit__testconsole(PyObject *spec)
+PyInit__testconsole(void)
 {
     return PyModuleDef_Init(&testconsole_def);
 }
diff --git a/PC/winreg.c b/PC/winreg.c
index e779224fd3b092..c0de5c1353a349 100644
--- a/PC/winreg.c
+++ b/PC/winreg.c
@@ -157,7 +157,7 @@ PyHKEY_deallocFunc(PyObject *ob)
 }
 
 static int
-PyHKEY_traverseFunc(PyHKEYObject *self, visitproc visit, void *arg)
+PyHKEY_traverseFunc(PyObject *self, visitproc visit, void *arg)
 {
     Py_VISIT(Py_TYPE(self));
     return 0;