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-rw-r--r--synapse/api/auth.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 80fe5d925d..5321864d51 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -372,7 +372,7 @@ class Auth(object):
         }
 
         removed = set(old_people.keys()) - set(new_people.keys())
-        added = set(old_people.keys()) - set(new_people.keys())
+        added = set(new_people.keys()) - set(old_people.keys())
         same = set(old_people.keys()) & set(new_people.keys())
 
         for r in removed: