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-rw-r--r--synapse/util/caches/expiringcache.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/util/caches/expiringcache.py b/synapse/util/caches/expiringcache.py
index 465adc54a8..ce85b2ae11 100644
--- a/synapse/util/caches/expiringcache.py
+++ b/synapse/util/caches/expiringcache.py
@@ -64,7 +64,7 @@ class ExpiringCache(object):
             return
 
         def f():
-            run_as_background_process(
+            return run_as_background_process(
                 "prune_cache_%s" % self._cache_name,
                 self._prune_cache,
             )