diff --git a/Include/moduleobject.h b/Include/moduleobject.h
index c43cb93..f50c729 100644
--- a/Include/moduleobject.h
+++ b/Include/moduleobject.h
@@ -14,8 +14,8 @@
 
 PyAPI_FUNC(PyObject *) PyModule_New(const char *);
 PyAPI_FUNC(PyObject *) PyModule_GetDict(PyObject *);
-PyAPI_FUNC(char *) PyModule_GetName(PyObject *);
-PyAPI_FUNC(char *) PyModule_GetFilename(PyObject *);
+PyAPI_FUNC(const char *) PyModule_GetName(PyObject *);
+PyAPI_FUNC(const char *) PyModule_GetFilename(PyObject *);
 PyAPI_FUNC(void) _PyModule_Clear(PyObject *);
 
 #ifdef __cplusplus
diff --git a/Objects/moduleobject.c b/Objects/moduleobject.c
index 6f7294a..19bb149 100644
--- a/Objects/moduleobject.c
+++ b/Objects/moduleobject.c
@@ -54,7 +54,7 @@
 	return d;
 }
 
-char *
+const char *
 PyModule_GetName(PyObject *m)
 {
 	PyObject *d;
@@ -79,7 +79,7 @@
 	return PyString_AsString(nameobj);
 }
 
-char *
+const char *
 PyModule_GetFilename(PyObject *m)
 {
 	PyObject *d;
@@ -120,8 +120,8 @@
 	/* First, clear only names starting with a single underscore */
 	pos = 0;
 	while (PyDict_Next(d, &pos, &key, &value)) {
-		if (value != Py_None && PyString_Check(key)) {
-			char *s = PyString_AsString(key);
+		if (value != Py_None && PyUnicode_Check(key)) {
+			const char *s = PyUnicode_AsString(key);
 			if (s[0] == '_' && s[1] != '_') {
 				if (Py_VerboseFlag > 1)
 				    PySys_WriteStderr("#   clear[1] %s\n", s);
@@ -133,8 +133,8 @@
 	/* Next, clear all names except for __builtins__ */
 	pos = 0;
 	while (PyDict_Next(d, &pos, &key, &value)) {
-		if (value != Py_None && PyString_Check(key)) {
-			char *s = PyString_AsString(key);
+		if (value != Py_None && PyUnicode_Check(key)) {
+			const char *s = PyUnicode_AsString(key);
 			if (s[0] != '_' || strcmp(s, "__builtins__") != 0) {
 				if (Py_VerboseFlag > 1)
 				    PySys_WriteStderr("#   clear[2] %s\n", s);
@@ -187,8 +187,8 @@
 static PyObject *
 module_repr(PyModuleObject *m)
 {
-	char *name;
-	char *filename;
+	const char *name;
+	const char *filename;
 
 	name = PyModule_GetName((PyObject *)m);
 	if (name == NULL) {