mercurial/cext/revlog.c

--- a/mercurial/cext/revlog.c	Sat Mar 03 06:08:22 2018 -0500
+++ b/mercurial/cext/revlog.c	Sat Mar 03 06:18:47 2018 -0500
@@ -1243,7 +1243,7 @@
 	char *node;
 	int rev, i;
 
-	if (!PyArg_ParseTuple(args, "s#", &node, &nodelen))
+	if (!PyArg_ParseTuple(args, PY23("s#", "y#"), &node, &nodelen))
 		return NULL;
 
 	if (nodelen < 4) {