diff --git a/src/allmydata/test/web/test_root.py b/src/allmydata/test/web/test_root.py
index 0715c8102..497440d1c 100644
--- a/src/allmydata/test/web/test_root.py
+++ b/src/allmydata/test/web/test_root.py
@@ -1,6 +1,6 @@
 import time
 
-from urllib import (
+from urllib.parse import (
     quote,
 )
 
@@ -77,7 +77,7 @@ class RenderSlashUri(unittest.TestCase):
         )
         self.assertEqual(
             response_body,
-            "Invalid capability",
+            b"Invalid capability",
         )
 
 
@@ -92,7 +92,7 @@ class RenderServiceRow(unittest.TestCase):
         ann = {"anonymous-storage-FURL": "pb://w2hqnbaa25yw4qgcvghl5psa3srpfgw3@tcp:127.0.0.1:51309/vucto2z4fxment3vfxbqecblbf6zyp6x",
                "permutation-seed-base32": "w2hqnbaa25yw4qgcvghl5psa3srpfgw3",
                }
-        srv = NativeStorageServer("server_id", ann, None, {}, EMPTY_CLIENT_CONFIG)
+        srv = NativeStorageServer(b"server_id", ann, None, {}, EMPTY_CLIENT_CONFIG)
         srv.get_connection_status = lambda: ConnectionStatus(False, "summary", {}, 0, 0)
 
         class FakeClient(_Client):
@@ -103,7 +103,7 @@ class RenderServiceRow(unittest.TestCase):
                     tub_maker=None,
                     node_config=EMPTY_CLIENT_CONFIG,
                 )
-                self.storage_broker.test_add_server("test-srv", srv)
+                self.storage_broker.test_add_server(b"test-srv", srv)
 
         root = RootElement(FakeClient(), time.time)
         req = DummyRequest(b"")
diff --git a/src/allmydata/web/root.py b/src/allmydata/web/root.py
index f6316bff5..5829da51e 100644
--- a/src/allmydata/web/root.py
+++ b/src/allmydata/web/root.py
@@ -2,7 +2,7 @@ from past.builtins import unicode
 
 import os
 import time
-import urllib
+from urllib.parse import quote as urlquote
 
 from hyperlink import DecodedURL, URL
 from pkg_resources import resource_filename
@@ -83,7 +83,7 @@ class URIHandler(resource.Resource, object):
         # it seems Nevow was creating absolute URLs including
         # host/port whereas req.uri is absolute (but lacks host/port)
         redir_uri = URL.from_text(req.prePathURL().decode('utf8'))
-        redir_uri = redir_uri.child(urllib.quote(uri_arg).decode('utf8'))
+        redir_uri = redir_uri.child(urlquote(uri_arg))
         # add back all the query args that AREN'T "?uri="
         for k, values in req.args.items():
             if k != b"uri":