diff --git a/hgext3rd/fbamend/split.py b/hgext3rd/fbamend/split.py
--- a/hgext3rd/fbamend/split.py
+++ b/hgext3rd/fbamend/split.py
@@ -60,6 +60,7 @@
         wlock = repo.wlock()
         lock = repo.lock()
         cmdutil.bailifchanged(repo)
+        cmdutil.checkunfinished(repo)
         tr = repo.transaction('split')
         ctx = repo[rev]
         r = ctx.rev()