diff --git a/hgext/fetch.py b/hgext/fetch.py
--- a/hgext/fetch.py
+++ b/hgext/fetch.py
@@ -24,13 +24,13 @@ def fetch(ui, repo, source='default', **
         if modheads == 0:
             return 0
         if modheads == 1:
-            return hg.update(repo, repo.changelog.tip(), wlock=wlock)
+            return hg.clean(repo, repo.changelog.tip(), wlock=wlock)
         newheads = repo.heads(parent)
         newchildren = [n for n in repo.heads(parent) if n != parent]
         newparent = parent
         if newchildren:
             newparent = newchildren[0]
-            hg.update(repo, newparent, wlock=wlock)
+            hg.clean(repo, newparent, wlock=wlock)
         newheads = [n for n in repo.heads() if n != newparent]
         err = False
         if newheads: