diff -r a2ffc966363e Lib/subprocess.py
--- a/Lib/subprocess.py	Wed Jun 01 14:38:18 2016 -0700
+++ b/Lib/subprocess.py	Thu Jun 02 03:18:13 2016 +0300
@@ -937,15 +937,18 @@
             self.stdin = io.open(p2cwrite, 'wb', bufsize)
             if universal_newlines:
                 self.stdin = io.TextIOWrapper(self.stdin, write_through=True,
+                                              encoding=self.stdin.encoding,
                                               line_buffering=(bufsize == 1))
         if c2pread != -1:
             self.stdout = io.open(c2pread, 'rb', bufsize)
             if universal_newlines:
-                self.stdout = io.TextIOWrapper(self.stdout)
+                self.stdout = io.TextIOWrapper(self.stdout,
+                                               encoding=sys.stdout.encoding)
         if errread != -1:
             self.stderr = io.open(errread, 'rb', bufsize)
             if universal_newlines:
-                self.stderr = io.TextIOWrapper(self.stderr)
+                self.stderr = io.TextIOWrapper(self.stderr,
+                                               encoding=sys.stderr.encoding)
 
         self._closed_child_pipe_fds = False
         try: