1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index ee607e6e65..f71bb28024 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -52,6 +52,7 @@ logger = logging.getLogger(__name__)
 # Debug logger for https://github.com/matrix-org/synapse/issues/4422
 issue4422_logger = logging.getLogger("synapse.handler.sync.4422_debug")
 
+SYNC_RESPONSE_CACHE_MS = 2 * 60 * 1000
 
 # Counts the number of times we returned a non-empty sync. `type` is one of
 # "initial_sync", "full_state_sync" or "incremental_sync", `lazy_loaded` is
@@ -244,7 +245,7 @@ class SyncHandler:
         self.event_sources = hs.get_event_sources()
         self.clock = hs.get_clock()
         self.response_cache = ResponseCache(
-            hs.get_clock(), "sync"
+            hs.get_clock(), "sync", timeout_ms=SYNC_RESPONSE_CACHE_MS
         )  # type: ResponseCache[Tuple[Any, ...]]
         self.state = hs.get_state_handler()
         self.auth = hs.get_auth()