diff -r a9a28ca17615 -r 7c09b071318a mercurial/scmposix.py
--- a/mercurial/scmposix.py	Sun Mar 12 07:35:13 2017 +0530
+++ b/mercurial/scmposix.py	Sun Mar 12 22:27:53 2017 +0530
@@ -66,7 +66,7 @@
             if not os.isatty(fd):
                 continue
             arri = fcntl.ioctl(fd, TIOCGWINSZ, '\0' * 8)
-            height, width = array.array('h', arri)[:2]
+            height, width = array.array(r'h', arri)[:2]
             if width > 0 and height > 0:
                 return width, height
         except ValueError: