diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 75ce991..2fe2b63 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -2135,7 +2135,8 @@
     FILEFINDBUF3   ep;
     APIRET rc;
 
-    if (!PyArg_ParseTuple(args, "t#:listdir", &name, &len))
+    if (!PyArg_ParseTuple(args, "et#:listdir", 
+                          Py_FileSystemDefaultEncoding, &name, &len))
         return NULL;
     if (len >= MAX_PATH) {
 		PyErr_SetString(PyExc_ValueError, "path too long");