diff --git a/mercurial/branchmap.py b/mercurial/branchmap.py
--- a/mercurial/branchmap.py
+++ b/mercurial/branchmap.py
@@ -407,9 +407,6 @@ class revbranchcache(object):
             try:
                 if self._rbcnamescount != 0:
                     f = repo.vfs.open(_rbcnames, 'ab')
-                    # The position after open(x, 'a') is implementation defined-
-                    # see issue3543.  SEEK_END was added in 2.5
-                    f.seek(0, 2) #os.SEEK_END
                     if f.tell() == self._rbcsnameslen:
                         f.write('\0')
                     else:
@@ -434,9 +431,6 @@ class revbranchcache(object):
             revs = min(len(repo.changelog), len(self._rbcrevs) // _rbcrecsize)
             try:
                 f = repo.vfs.open(_rbcrevs, 'ab')
-                # The position after open(x, 'a') is implementation defined-
-                # see issue3543.  SEEK_END was added in 2.5
-                f.seek(0, 2) #os.SEEK_END
                 if f.tell() != start:
                     repo.ui.debug("truncating %s to %s\n" % (_rbcrevs, start))
                     f.seek(start)