diff --git a/contrib/all-revsets.txt b/contrib/all-revsets.txt
--- a/contrib/all-revsets.txt
+++ b/contrib/all-revsets.txt
@@ -137,4 +137,4 @@ draft()
 secret()
 
 # test finding common ancestors
-heads(commonancestors(46879 + ae7f))
+heads(commonancestors(last(head(), 2)))