diff --git a/contrib/python3-whitelist b/contrib/python3-whitelist
--- a/contrib/python3-whitelist
+++ b/contrib/python3-whitelist
@@ -206,6 +206,7 @@
 test-gpg.t
 test-graft.t
 test-grep.t
+test-hardlinks.t
 test-hg-parseurl.py
 test-hghave.t
 test-hgignore.t
diff --git a/tests/test-hardlinks.t b/tests/test-hardlinks.t
--- a/tests/test-hardlinks.t
+++ b/tests/test-hardlinks.t
@@ -20,7 +20,7 @@
   > from __future__ import absolute_import
   > import sys
   > from mercurial import util
-  > util.copyfiles(sys.argv[1], sys.argv[2], hardlink=True)
+  > util.copyfiles(sys.argv[1].encode(), sys.argv[2].encode(), hardlink=True)
   > EOF
 
   $ linkcp()