--- a/mercurial/parsers.c	Thu Oct 13 13:27:14 2016 +0200
+++ b/mercurial/parsers.c	Thu Oct 13 13:34:53 2016 +0200
@@ -2276,7 +2276,12 @@
 	Py_ssize_t length = index_length(self);
 	int ret = 0;
 
+/* Argument changed from PySliceObject* to PyObject* in Python 3. */
+#ifdef IS_PY3K
+	if (PySlice_GetIndicesEx(item, length,
+#else
 	if (PySlice_GetIndicesEx((PySliceObject*)item, length,
+#endif
 				 &start, &stop, &step, &slicelength) < 0)
 		return -1;