diff --git a/synapse/rest/admin/_base.py b/synapse/rest/admin/_base.py

index e09234c644..7681e55b58 100644
--- a/synapse/rest/admin/_base.py
+++ b/synapse/rest/admin/_base.py
@@ -15,10 +15,9 @@
 
 import re
 
-import twisted.web.server
-
-import synapse.api.auth
+from synapse.api.auth import Auth
 from synapse.api.errors import AuthError
+from synapse.http.site import SynapseRequest
 from synapse.types import UserID
 
 
@@ -37,13 +36,11 @@ def admin_patterns(path_regex: str, version: str = "v1"):
     return patterns
 
 
-async def assert_requester_is_admin(
-    auth: synapse.api.auth.Auth, request: twisted.web.server.Request
-) -> None:
+async def assert_requester_is_admin(auth: Auth, request: SynapseRequest) -> None:
     """Verify that the requester is an admin user
 
     Args:
-        auth: api.auth.Auth singleton
+        auth: Auth singleton
         request: incoming request
 
     Raises:
@@ -53,11 +50,11 @@ async def assert_requester_is_admin(
     await assert_user_is_admin(auth, requester.user)
 
 
-async def assert_user_is_admin(auth: synapse.api.auth.Auth, user_id: UserID) -> None:
+async def assert_user_is_admin(auth: Auth, user_id: UserID) -> None:
     """Verify that the given user is an admin user
 
     Args:
-        auth: api.auth.Auth singleton
+        auth: Auth singleton
         user_id: user to check
 
     Raises:
diff --git a/synapse/rest/admin/media.py b/synapse/rest/admin/media.py

index 511c859f64..7fcc48a9d7 100644
--- a/synapse/rest/admin/media.py
+++ b/synapse/rest/admin/media.py
@@ -17,10 +17,9 @@
 import logging
 from typing import TYPE_CHECKING, Tuple
 
-from twisted.web.server import Request
-
 from synapse.api.errors import AuthError, Codes, NotFoundError, SynapseError
 from synapse.http.servlet import RestServlet, parse_boolean, parse_integer
+from synapse.http.site import SynapseRequest
 from synapse.rest.admin._base import (
     admin_patterns,
     assert_requester_is_admin,
@@ -50,7 +49,9 @@ class QuarantineMediaInRoom(RestServlet):
         self.store = hs.get_datastore()
         self.auth = hs.get_auth()
 
-    async def on_POST(self, request: Request, room_id: str) -> Tuple[int, JsonDict]:
+    async def on_POST(
+        self, request: SynapseRequest, room_id: str
+    ) -> Tuple[int, JsonDict]:
         requester = await self.auth.get_user_by_req(request)
         await assert_user_is_admin(self.auth, requester.user)
 
@@ -75,7 +76,9 @@ class QuarantineMediaByUser(RestServlet):
         self.store = hs.get_datastore()
         self.auth = hs.get_auth()
 
-    async def on_POST(self, request: Request, user_id: str) -> Tuple[int, JsonDict]:
+    async def on_POST(
+        self, request: SynapseRequest, user_id: str
+    ) -> Tuple[int, JsonDict]:
         requester = await self.auth.get_user_by_req(request)
         await assert_user_is_admin(self.auth, requester.user)
 
@@ -103,7 +106,7 @@ class QuarantineMediaByID(RestServlet):
         self.auth = hs.get_auth()
 
     async def on_POST(
-        self, request: Request, server_name: str, media_id: str
+        self, request: SynapseRequest, server_name: str, media_id: str
     ) -> Tuple[int, JsonDict]:
         requester = await self.auth.get_user_by_req(request)
         await assert_user_is_admin(self.auth, requester.user)
@@ -127,7 +130,9 @@ class ProtectMediaByID(RestServlet):
         self.store = hs.get_datastore()
         self.auth = hs.get_auth()
 
-    async def on_POST(self, request: Request, media_id: str) -> Tuple[int, JsonDict]:
+    async def on_POST(
+        self, request: SynapseRequest, media_id: str
+    ) -> Tuple[int, JsonDict]:
         requester = await self.auth.get_user_by_req(request)
         await assert_user_is_admin(self.auth, requester.user)
 
@@ -148,7 +153,9 @@ class ListMediaInRoom(RestServlet):
         self.store = hs.get_datastore()
         self.auth = hs.get_auth()
 
-    async def on_GET(self, request: Request, room_id: str) -> Tuple[int, JsonDict]:
+    async def on_GET(
+        self, request: SynapseRequest, room_id: str
+    ) -> Tuple[int, JsonDict]:
         requester = await self.auth.get_user_by_req(request)
         is_admin = await self.auth.is_server_admin(requester.user)
         if not is_admin:
@@ -166,7 +173,7 @@ class PurgeMediaCacheRestServlet(RestServlet):
         self.media_repository = hs.get_media_repository()
         self.auth = hs.get_auth()
 
-    async def on_POST(self, request: Request) -> Tuple[int, JsonDict]:
+    async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
         await assert_requester_is_admin(self.auth, request)
 
         before_ts = parse_integer(request, "before_ts", required=True)
@@ -189,7 +196,7 @@ class DeleteMediaByID(RestServlet):
         self.media_repository = hs.get_media_repository()
 
     async def on_DELETE(
-        self, request: Request, server_name: str, media_id: str
+        self, request: SynapseRequest, server_name: str, media_id: str
     ) -> Tuple[int, JsonDict]:
         await assert_requester_is_admin(self.auth, request)
 
@@ -218,7 +225,9 @@ class DeleteMediaByDateSize(RestServlet):
         self.server_name = hs.hostname
         self.media_repository = hs.get_media_repository()
 
-    async def on_POST(self, request: Request, server_name: str) -> Tuple[int, JsonDict]:
+    async def on_POST(
+        self, request: SynapseRequest, server_name: str
+    ) -> Tuple[int, JsonDict]:
         await assert_requester_is_admin(self.auth, request)
 
         before_ts = parse_integer(request, "before_ts", required=True)