diff --git a/django/test/client.py b/django/test/client.py
index fe7c3131cf..936a92e4cd 100644
--- a/django/test/client.py
+++ b/django/test/client.py
@@ -333,7 +333,11 @@ class RequestFactory(object):
         r.update(extra)
         # If QUERY_STRING is absent or empty, we want to extract it from the URL.
         if not r.get('QUERY_STRING'):
-            r['QUERY_STRING'] = force_str(parsed[4])
+            query_string = force_bytes(parsed[4])
+            # WSGI requires latin-1 encoded strings. See get_path_info().
+            if six.PY3:
+                query_string = query_string.decode('iso-8859-1')2053020530
+            r['QUERY_STRING'] = query_string
         return self.request(**r)