diff --git a/Include/traceback.h b/Include/traceback.h
index e7943da..fc0c586 100644
--- a/Include/traceback.h
+++ b/Include/traceback.h
@@ -10,16 +10,16 @@
 /* Traceback interface */
 
 typedef struct _traceback {
-	PyObject_HEAD
-	struct _traceback *tb_next;
-	struct _frame *tb_frame;
-	int tb_lasti;
-	int tb_lineno;
+    PyObject_HEAD
+    struct _traceback *tb_next;
+    struct _frame *tb_frame;
+    int tb_lasti;
+    int tb_lineno;
 } PyTracebackObject;
 
 PyAPI_FUNC(int) PyTraceBack_Here(struct _frame *);
 PyAPI_FUNC(int) PyTraceBack_Print(PyObject *, PyObject *);
-PyAPI_FUNC(int) _Py_DisplaySourceLine(PyObject *, const char *, int, int);
+PyAPI_FUNC(int) _Py_DisplaySourceLine(PyObject *, PyObject *, int, int);
 
 /* Reveal traceback type so we can typecheck traceback objects */
 PyAPI_DATA(PyTypeObject) PyTraceBack_Type;