cqlsh fails and exits on non-ascii chars

$ bin/cqlsh
Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 2.1.13-SNAPSHOT | CQL spec 3.2.1 | Native protocol v3]
Use HELP for help.
cqlsh> ä
Invalid syntax at line 1, char 1
Traceback (most recent call last):
  File "/Users/snazy/devel/cassandra/trunk/bin/cqlsh.py", line 2636, in <module>
    main(*read_options(sys.argv[1:], os.environ))
  File "/Users/snazy/devel/cassandra/trunk/bin/cqlsh.py", line 2625, in main
    shell.cmdloop()
  File "/Users/snazy/devel/cassandra/trunk/bin/cqlsh.py", line 1114, in cmdloop
    if self.onecmd(self.statement.getvalue()):
  File "/Users/snazy/devel/cassandra/trunk/bin/cqlsh.py", line 1139, in onecmd
    self.printerr('  %s' % statementline)
  File "/Users/snazy/devel/cassandra/trunk/bin/cqlsh.py", line 2314, in printerr
    self.writeresult(text, color, newline=newline, out=sys.stderr)
  File "/Users/snazy/devel/cassandra/trunk/bin/cqlsh.py", line 2303, in writeresult
    out.write(self.applycolor(str(text), color) + ('\n' if newline else ''))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe4' in position 2: ordinal not in range(128)
$