diff -r c35ffa4249ca -r a7f25a31e021 hgext/convert/git.py
--- a/hgext/convert/git.py	Wed Nov 05 17:25:00 2014 +0000
+++ b/hgext/convert/git.py	Thu Nov 06 09:36:39 2014 +0100
@@ -99,7 +99,7 @@
         if similarity < 0 or similarity > 100:
             raise util.Abort(_('similarity must be between 0 and 100'))
         if similarity > 0:
-            self.simopt = '--find-copies=%d%%' % similarity
+            self.simopt = '-C%d%%' % similarity
             findcopiesharder = ui.configbool('convert', 'git.findcopiesharder',
                                              False)
             if findcopiesharder: