--- a/mercurial/util.py	Wed Mar 29 12:26:46 2017 -0700
+++ b/mercurial/util.py	Wed Mar 29 12:37:03 2017 -0700
@@ -1144,7 +1144,7 @@
             num += n
     else:
         if hardlink is None:
-            hardlink = (os.stat(src).st_dev ==
+            hardlink = (os.stat(os.path.dirname(src)).st_dev ==
                         os.stat(os.path.dirname(dst)).st_dev)
         topic = gettopic()