diff --git a/Lib/test/test_cext/extension.c b/Lib/test/test_cext/extension.c
index 28531b47383b85..a2f6151d8b36ed 100644
--- a/Lib/test/test_cext/extension.c
+++ b/Lib/test/test_cext/extension.c
@@ -74,13 +74,7 @@ static PyMethodDef _testcext_methods[] = {
 
 
 static int
-_testcext_exec(
-#ifdef __STDC_VERSION__
-    PyObject *module
-#else
-    PyObject *Py_UNUSED(module)
-#endif
-    )
+_testcext_exec(PyObject *module)
 {
     PyObject *result;