diff -r 3156dd82df2d -r 14806af36c62 Include/traceback.h
--- a/Include/traceback.h	Wed Jun 10 15:44:18 2015 -0700
+++ b/Include/traceback.h	Thu Jun 11 21:11:21 2015 +0200
@@ -24,7 +24,7 @@
 PyAPI_FUNC(int) PyTraceBack_Print(PyObject *, PyObject *);
 #ifndef Py_LIMITED_API
 PyAPI_FUNC(int) _Py_DisplaySourceLine(PyObject *, PyObject *, int, int);
-PyAPI_FUNC(void) _PyTraceback_Add(char *, char *, int);
+PyAPI_FUNC(void) _PyTraceback_Add(const char *, const char *, int);
 #endif
 
 /* Reveal traceback type so we can typecheck traceback objects */
diff -r 3156dd82df2d -r 14806af36c62 Python/traceback.c
--- a/Python/traceback.c	Wed Jun 10 15:44:18 2015 -0700
+++ b/Python/traceback.c	Thu Jun 11 21:11:21 2015 +0200
@@ -143,7 +143,7 @@
 }
 
 /* Insert a frame into the traceback for (funcname, filename, lineno). */
-void _PyTraceback_Add(char *funcname, char *filename, int lineno)
+void _PyTraceback_Add(const char *funcname, const char *filename, int lineno)
 {
     PyObject *globals = NULL;
     PyCodeObject *code = NULL;