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-rw-r--r--synapse/util/caches/stream_change_cache.py5
1 files changed, 1 insertions, 4 deletions
diff --git a/synapse/util/caches/stream_change_cache.py b/synapse/util/caches/stream_change_cache.py
index c1e76b1a0e..f2bde74dc5 100644
--- a/synapse/util/caches/stream_change_cache.py
+++ b/synapse/util/caches/stream_change_cache.py
@@ -80,10 +80,7 @@ class StreamChangeCache(object):
                 )
             }
 
-            result = {
-                e for e in entities
-                if e in changed_entities
-            }
+            result = changed_entities.intersection(entities)
 
             self.metrics.inc_hits()
         else: