diff --git a/HowtoContributeABuildbot.md b/HowtoContributeABuildbot.md
index 302c897..17d9fa8 100644
--- a/HowtoContributeABuildbot.md
+++ b/HowtoContributeABuildbot.md
@@ -1,4 +1,4 @@
-From <http://allmydata.org/pipermail/tahoe-dev/2009-December/003279.html>:
+From <http://tahoe-lafs.org/pipermail/tahoe-dev/2009-December/003279.html>:
 
 Note: These instructions omit the fact that you must install darcs as a prerequisite to setup a build slave.