--- pipermail.py.old	2007-12-11 12:16:30.000000000 -0600
+++ pipermail.py	2007-12-11 12:00:02.000000000 -0600
@@ -491,7 +491,7 @@
             if article is not None:
                 artkey = article.threadKey
             if artkey is not None:
-                self.write_threadindex_entry(article, artkey.count('-') - 1)
+                self.write_threadindex_entry(article, artkey.count('@') - 1)
                 if self.database.changed.has_key((archive,article.msgid)):
                     a1 = L[1]
                     a3 = L[3]