Index: Python/errors.c
===================================================================
--- Python/errors.c	(revision 62703)
+++ Python/errors.c	(working copy)
@@ -349,7 +349,7 @@
 
 
 PyObject *
-PyErr_SetFromErrnoWithFilename(PyObject *exc, char *filename)
+PyErr_SetFromErrnoWithFilename(PyObject *exc, const char *filename)
 {
 	PyObject *name = filename ? PyString_FromString(filename) : NULL;
 	PyObject *result = PyErr_SetFromErrnoWithFilenameObject(exc, name);
Index: Include/pyerrors.h
===================================================================
--- Include/pyerrors.h	(revision 62703)
+++ Include/pyerrors.h	(working copy)
@@ -185,7 +185,8 @@
 PyAPI_FUNC(PyObject *) PyErr_SetFromErrno(PyObject *);
 PyAPI_FUNC(PyObject *) PyErr_SetFromErrnoWithFilenameObject(
 	PyObject *, PyObject *);
-PyAPI_FUNC(PyObject *) PyErr_SetFromErrnoWithFilename(PyObject *, char *);
+PyAPI_FUNC(PyObject *) PyErr_SetFromErrnoWithFilename(PyObject *,
+		const char *);
 #ifdef Py_WIN_WIDE_FILENAMES
 PyAPI_FUNC(PyObject *) PyErr_SetFromErrnoWithUnicodeFilename(
 	PyObject *, Py_UNICODE *);