diff -r f3200bf460a8 -r d0d3e5c6eb3c hgext/rebase.py
--- a/hgext/rebase.py	Sat Aug 16 10:43:59 2014 +0900
+++ b/hgext/rebase.py	Sat Aug 16 10:43:59 2014 +0900
@@ -138,7 +138,6 @@
     skipped = set()
     targetancestors = set()
 
-    editor = cmdutil.getcommiteditor(editform='rebase.normal', **opts)
 
     lock = wlock = None
     try:
@@ -354,6 +353,9 @@
                     p1rev = repo[rev].p1().rev()
                     cmdutil.duplicatecopies(repo, rev, p1rev, skiprev=target)
                 if not collapsef:
+                    merging = repo[p2].rev() != nullrev
+                    editform = cmdutil.mergeeditform(merging, 'rebase')
+                    editor = cmdutil.getcommiteditor(editform=editform, **opts)
                     newrev = concludenode(repo, rev, p1, p2, extrafn=extrafn,
                                           editor=editor)
                 else: