diff --git a/roles/git/hooks/files/post-receive-fedora-messaging b/roles/git/hooks/files/post-receive-fedora-messaging
index da91ab8a24..0147f7cebb 100644
--- a/roles/git/hooks/files/post-receive-fedora-messaging
+++ b/roles/git/hooks/files/post-receive-fedora-messaging
@@ -120,7 +120,7 @@ for line in lines:
         revs = [head.id]
 
     def _build_commit(rev):
-        commit = repo.revparse_single(rev)
+        commit = repo.revparse_single(rev.hex)
 
         # Tags are a little funny, and vary between versions of pygit2, so we'll
         # just ignore them as far as fedmsg is concerned.