diff -r 2cf1e5207fdf -r 2912b06905dc mercurial/sslutil.py
--- a/mercurial/sslutil.py	Wed Feb 22 10:14:18 2017 -0800
+++ b/mercurial/sslutil.py	Mon Feb 20 18:40:42 2017 +0530
@@ -720,7 +720,8 @@
     # to load the system CA store. If we're running on Apple Python, use this
     # trick.
     if _plainapplepython():
-        dummycert = os.path.join(os.path.dirname(__file__), 'dummycert.pem')
+        dummycert = os.path.join(
+            os.path.dirname(pycompat.fsencode(__file__)), 'dummycert.pem')
         if os.path.exists(dummycert):
             return dummycert