diff -r a2edb4481f19 -r 9a9ea2d1d3c4 mercurial/revlog.py
--- a/mercurial/revlog.py	Fri Jun 03 18:42:53 2005 -0800
+++ b/mercurial/revlog.py	Sat Jun 04 11:10:42 2005 -0800
@@ -159,7 +159,7 @@
     def heads(self):
         p = {}
         h = []
-        for r in range(self.count() - 1, 0, -1):
+        for r in range(self.count() - 1, -1, -1):
             n = self.node(r)
             if n not in p:
                 h.append(n)