diff --git a/AUTHORS.rst b/AUTHORS.rst
index 1d66c4bf..9a7f25d5 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -114,3 +114,4 @@ Patches and Suggestions
 - Ian Cordasco <graffatcolmingov@gmail.com> @sigmavirus24
 - Rhys Elsmore
 - André Graf (dergraf)
+- Stephen Zhuang (everbird)
diff --git a/requests/models.py b/requests/models.py
index f02cec33..c19d3cca 100644
--- a/requests/models.py
+++ b/requests/models.py
@@ -360,9 +360,9 @@ class Request(object):
         for field, val in fields:
             if isinstance(val, list):
                 for v in val:
-                    new_fields.append((field, str(v)))
+                    new_fields.append((field, builtin_str(v)))
             else:
-                new_fields.append((field, str(val)))
+                new_fields.append((field, builtin_str(val)))
 
         for (k, v) in files:
             # support for explicit filename
diff --git a/tests/test_requests.py b/tests/test_requests.py
index 9ed4ad03..27da6b92 100755
--- a/tests/test_requests.py
+++ b/tests/test_requests.py
@@ -338,12 +338,23 @@ class RequestsTestSuite(TestSetup, TestBaseMixin, unittest.TestCase):
 
             with open(__file__) as f:
                 url = service('post')
-                post1 = post(url,
-                             files={'some': f},
-                             data={'some': 'data'})
+                post1 = post(url, data={'some': 'data'}, files={'some': f})
                 post2 = post(url, data={'some': 'data'}, files=[('some', f)])
-                post3 = post(url, data=[('some', 'data')],
-                        files=[('some', f)])
+                post3 = post(url, data=[('some', 'data')], files=[('some', f)])
+
+            self.assertEqual(post1.status_code, 200)
+            self.assertEqual(post2.status_code, 200)
+            self.assertEqual(post3.status_code, 200)
+
+    def test_POSTBIN_GET_POST_FILES_WITH_CJK_PARAMS(self):
+
+        for service in SERVICES:
+
+            with open(__file__) as f:
+                url = service('post')
+                post1 = post(url, data={'some': '中文'}, files={'some': f})
+                post2 = post(url, data={'some': '日本語'}, files=[('some', f)])
+                post3 = post(url, data=[('some', '한국의')], files=[('some', f)])
 
             self.assertEqual(post1.status_code, 200)
             self.assertEqual(post2.status_code, 200)