1 files changed, 6 insertions, 4 deletions
diff --git a/synapse/http/federation/well_known_resolver.py b/synapse/http/federation/well_known_resolver.py
index ecd63e6596..ce4079f15c 100644
--- a/synapse/http/federation/well_known_resolver.py
+++ b/synapse/http/federation/well_known_resolver.py
@@ -71,8 +71,10 @@ WELL_KNOWN_RETRY_ATTEMPTS = 3
 logger = logging.getLogger(__name__)
 
 
-_well_known_cache = TTLCache("well-known")
-_had_valid_well_known_cache = TTLCache("had-valid-well-known")
+_well_known_cache = TTLCache("well-known")  # type: TTLCache[bytes, Optional[bytes]]
+_had_valid_well_known_cache = TTLCache(
+    "had-valid-well-known"
+)  # type: TTLCache[bytes, bool]
 
 
 @attr.s(slots=True, frozen=True)
@@ -88,8 +90,8 @@ class WellKnownResolver:
         reactor: IReactorTime,
         agent: IAgent,
         user_agent: bytes,
-        well_known_cache: Optional[TTLCache] = None,
-        had_well_known_cache: Optional[TTLCache] = None,
+        well_known_cache: Optional[TTLCache[bytes, Optional[bytes]]] = None,
+        had_well_known_cache: Optional[TTLCache[bytes, bool]] = None,
     ):
         self._reactor = reactor
         self._clock = Clock(reactor)