diff --git a/project.py b/project.py
index b81c10a..dbc3ae6 100644
--- a/project.py
+++ b/project.py
@@ -1081,6 +1081,12 @@
         _warn("Cannot remove archive %s: %s", tarpath, str(e))
       self._CopyAndLinkFiles()
       return True
+
+    # If the shared object dir already exists, don't try to rebootstrap with a
+    # clone bundle download.  We should have the majority of objects already.
+    if clone_bundle and os.path.exists(self.objdir):
+      clone_bundle = False
+
     if is_new is None:
       is_new = not self.Exists
     if is_new: