diff --git a/wsme/protocols/restxml.py b/wsme/protocols/restxml.py
index 5c58176..e9d8608 100644
--- a/wsme/protocols/restxml.py
+++ b/wsme/protocols/restxml.py
@@ -1,6 +1,7 @@
 import datetime
 
 from six import u
+import six
 
 try:
     import xml.etree.ElementTree as et
@@ -63,7 +64,7 @@ def toxml(datatype, key, value):
                 el.append(toxml(attrdef.datatype, attrdef.name,
                                 getattr(value, attrdef.key)))
         else:
-            el.text = unicode(value)
+            el.text = six.text_type(value)
     return el
 
 
diff --git a/wsme/root.py b/wsme/root.py
index 18f2bd2..4b98d98 100644
--- a/wsme/root.py
+++ b/wsme/root.py
@@ -4,6 +4,7 @@ import traceback
 import weakref
 
 from six import u, b
+import six
 
 import webob
 
@@ -166,7 +167,20 @@ class WSRoot(object):
 
     def _handle_request(self, request):
         def default_prepare_response_body(request, results):
-            return u('\n').join(results)
+            r = None
+            sep = None
+            for value in results:
+                if sep is None:
+                    if isinstance(value, six.text_type):
+                        sep = u('\n')
+                        r = u('')
+                    else:
+                        sep = b('\n')
+                        r = b('')
+                else:
+                    r += sep
+                r += value
+            return r
 
         res = webob.Response()
         res_content_type = None
@@ -207,7 +221,11 @@ class WSRoot(object):
             body = prepare_response_body(request, (
                 self._do_call(protocol, context)
                 for context in protocol.iter_calls(request)))
-            res.unicode_body = body
+
+            if isinstance(body, six.text_type):
+                res.text = body
+            else:
+                res.body = body
 
             if len(request.calls) == 1:
                 if hasattr(protocol, 'get_response_status'):
diff --git a/wsme/tests/test_restxml.py b/wsme/tests/test_restxml.py
index 796d28b..96364ae 100644
--- a/wsme/tests/test_restxml.py
+++ b/wsme/tests/test_restxml.py
@@ -2,7 +2,7 @@ import decimal
 import datetime
 import base64
 
-from six import u
+from six import u, b
 import six
 
 import wsme.tests.protocol
@@ -25,16 +25,17 @@ def dumpxml(key, obj, datatype=None):
         for item in obj:
             el.append(dumpxml('item', item, datatype[0]))
     elif isinstance(datatype, dict):
+        key_type, value_type = list(datatype.items())[0]
         for item in obj.items():
             node = et.SubElement(el, 'item')
-            node.append(dumpxml('key', item[0], datatype.keys()[0]))
-            node.append(dumpxml('value', item[1], datatype.values()[0]))
+            node.append(dumpxml('key', item[0], key_type))
+            node.append(dumpxml('value', item[1], value_type))
     elif datatype == wsme.types.binary:
         el.text = base64.encodestring(obj)
     elif isinstance(obj, six.string_types):
         el.text = obj
     elif type(obj) in (int, float, decimal.Decimal):
-        el.text = str(obj)
+        el.text = six.text_type(obj)
     elif type(obj) in (datetime.date, datetime.time, datetime.datetime):
         el.text = obj.isoformat()
     elif hasattr(datatype, '_wsme_attributes'):
@@ -154,7 +155,7 @@ class TestRestXML(wsme.tests.protocol.ProtocolTestCase):
                 [int], {int: str}, bool,
                 datetime.date, datetime.time, datetime.datetime):
             x = et.tostring(toxml(dt, 'value', None))
-            assert x == '<value nil="true" />', x
+            assert x == b('<value nil="true" />'), x
 
     def test_parse_arg(self):
         e = self.root.protocols[0].parse_arg('value', '5')