diff -r 62b1b6a89d2a -r 983e93d88193 mercurial/pvec.py
--- a/mercurial/pvec.py	Tue Dec 22 15:25:40 2015 -0800
+++ b/mercurial/pvec.py	Mon Dec 21 21:32:58 2015 -0800
@@ -48,8 +48,13 @@
   different branches
 '''
 
-import base85, util
-from node import nullrev
+from __future__ import absolute_import
+
+from .node import nullrev
+from . import (
+    base85,
+    util,
+)
 
 _size = 448 # 70 chars b85-encoded
 _bytes = _size / 8