diff --git a/changelog.d/7314.misc b/changelog.d/7314.misc
new file mode 100644
index 000000000000..30720100c298
--- /dev/null
+++ b/changelog.d/7314.misc
@@ -0,0 +1 @@
+Allow guest access to the `GET /_matrix/client/r0/rooms/{room_id}/members` endpoint, according to MSC2689. Contributed by Awesome Technologies Innovationslabor GmbH.
diff --git a/synapse/rest/client/v1/room.py b/synapse/rest/client/v1/room.py
index 26d5a51cb254..2ab30ce8977d 100644
--- a/synapse/rest/client/v1/room.py
+++ b/synapse/rest/client/v1/room.py
@@ -444,7 +444,7 @@ def __init__(self, hs):
 
     async def on_GET(self, request, room_id):
         # TODO support Pagination stream API (limit/tokens)
-        requester = await self.auth.get_user_by_req(request)
+        requester = await self.auth.get_user_by_req(request, allow_guest=True)
         handler = self.message_handler
 
         # request the state as of a given event, as identified by a stream token,