diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c
index 5644cc05c45800..7f4f1d939fb7e9 100644
--- a/Modules/_io/_iomodule.c
+++ b/Modules/_io/_iomodule.c
@@ -616,8 +616,9 @@ iomodule_clear(PyObject *mod) {
 }
 
 static void
-iomodule_free(PyObject *mod) {
-    iomodule_clear(mod);
+iomodule_free(void *mod)
+{
+    (void)iomodule_clear((PyObject *)mod);
 }