diff --git a/daphne/http_protocol.py b/daphne/http_protocol.py
index 6049c30..673ee6a 100755
--- a/daphne/http_protocol.py
+++ b/daphne/http_protocol.py
@@ -133,7 +133,7 @@ class WebRequest(http.Request):
                         "path": self.unquote(self.path),
                         "root_path": self.root_path,
                         "scheme": "http",
-                        "query_string": self.unquote(self.query_string, plus_as_space=True),
+                        "query_string": self.query_string,
                         "headers": self.clean_headers,
                         "body": self.content.read(),
                         "client": self.client_addr,
diff --git a/daphne/tests/test_http.py b/daphne/tests/test_http.py
index d0365a0..49d83ef 100644
--- a/daphne/tests/test_http.py
+++ b/daphne/tests/test_http.py
@@ -25,7 +25,7 @@ class TestHTTPProtocol(TestCase):
         """
         # Send a simple request to the protocol
         self.proto.dataReceived(
-            b"GET /te%20st-%C3%A0/?foo=bar HTTP/1.1\r\n" +
+            b"GET /te%20st-%C3%A0/?foo=+bar HTTP/1.1\r\n" +
             b"Host: somewhere.com\r\n" +
             b"\r\n"
         )
@@ -35,7 +35,7 @@ class TestHTTPProtocol(TestCase):
         self.assertEqual(message['method'], "GET")
         self.assertEqual(message['scheme'], "http")
         self.assertEqual(message['path'], "/te st-à/")
-        self.assertEqual(message['query_string'], "foo=bar")
+        self.assertEqual(message['query_string'], b"foo=+bar")
         self.assertEqual(message['headers'], [(b"host", b"somewhere.com")])
         self.assertFalse(message.get("body", None))
         self.assertTrue(message['reply_channel'])