diff --git a/tests/revlog-formatv0.py b/tests/revlog-formatv0.py
--- a/tests/revlog-formatv0.py
+++ b/tests/revlog-formatv0.py
@@ -18,6 +18,7 @@
 """
 
 from __future__ import absolute_import
+import binascii
 import os
 import sys
 
@@ -56,7 +57,7 @@
 
 for name, data in files:
     f = open(name, 'wb')
-    f.write(data.decode('hex'))
+    f.write(binascii.unhexlify(data))
     f.close()
 
 sys.exit(0)