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-rw-r--r--synapse/util/ratelimitutils.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/util/ratelimitutils.py b/synapse/util/ratelimitutils.py
index 1101881a2d..18424f6c36 100644
--- a/synapse/util/ratelimitutils.py
+++ b/synapse/util/ratelimitutils.py
@@ -18,7 +18,7 @@ from twisted.internet import defer
 from synapse.api.errors import LimitExceededError
 
 from synapse.util.async import sleep
-from synapse.util.logcontext import preserve_fn
+from synapse.util.logcontext import run_in_background
 
 import collections
 import contextlib
@@ -150,7 +150,7 @@ class _PerHostRatelimiter(object):
                 "Ratelimit [%s]: sleeping req",
                 id(request_id),
             )
-            ret_defer = preserve_fn(sleep)(self.sleep_msec / 1000.0)
+            ret_defer = run_in_background(sleep, self.sleep_msec / 1000.0)
 
             self.sleeping_requests.add(request_id)