diff --git a/synapse/http/additional_resource.py b/synapse/http/additional_resource.py
index bf9069af5bc5..9a2684aca432 100644
--- a/synapse/http/additional_resource.py
+++ b/synapse/http/additional_resource.py
@@ -32,7 +32,7 @@ class AdditionalResource(DirectServeJsonResource):
     and exception handling.
     """
 
-    def __init__(self, hs: "HomeServer", handler: Request):
+    def __init__(self, hs: "HomeServer", handler):
         """Initialise AdditionalResource
 
         The ``handler`` should return a deferred which completes when it has
@@ -41,7 +41,7 @@ def __init__(self, hs: "HomeServer", handler: Request):
 
         Args:
             hs: homeserver
-            handler (twisted.internet.defer.Deferred):
+            handler ((twisted.web.server.Request) -> twisted.internet.defer.Deferred):
                 function to be called to handle the request.
         """
         super().__init__()
diff --git a/synapse/http/federation/srv_resolver.py b/synapse/http/federation/srv_resolver.py
index 6a9ce33d4ebf..eeb1a97dcdf0 100644
--- a/synapse/http/federation/srv_resolver.py
+++ b/synapse/http/federation/srv_resolver.py
@@ -28,7 +28,7 @@
 
 logger = logging.getLogger(__name__)
 
-SERVER_CACHE: Dict[bytes, List[Server]] = {}
+SERVER_CACHE: Dict[bytes, List] = {}
 
 
 @attr.s(auto_attribs=True, slots=True, frozen=True)