diff -r cf7de4aeb86b -r 261c25372959 hgext/rebase.py
--- a/hgext/rebase.py	Sat Apr 30 18:41:08 2016 +0200
+++ b/hgext/rebase.py	Sat Apr 30 18:39:39 2016 +0200
@@ -1244,6 +1244,9 @@
                 # --source.
                 if 'source' in opts:
                     del opts['source']
+                # revsprepull is the len of the repo, not revnum of tip.
+                destspace = list(repo.changelog.revs(start=revsprepull))
+                opts['_destspace'] = destspace
                 try:
                     rebase(ui, repo, **opts)
                 except error.NoMergeDestAbort: