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-rw-r--r--synapse/rest/key/v2/local_key_resource.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/rest/key/v2/local_key_resource.py b/synapse/rest/key/v2/local_key_resource.py
index 12b3ae120c..b9bfbea21b 100644
--- a/synapse/rest/key/v2/local_key_resource.py
+++ b/synapse/rest/key/v2/local_key_resource.py
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 import logging
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Optional
 
 from canonicaljson import encode_canonical_json
 from signedjson.sign import sign_json
@@ -99,7 +99,7 @@ class LocalKey(Resource):
             json_object = sign_json(json_object, self.config.server.server_name, key)
         return json_object
 
-    def render_GET(self, request: Request) -> int:
+    def render_GET(self, request: Request) -> Optional[int]:
         time_now = self.clock.time_msec()
         # Update the expiry time if less than half the interval remains.
         if time_now + self.config.key.key_refresh_interval / 2 > self.valid_until_ts: