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-rw-r--r--synapse/rest/client/v2_alpha/keys.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/rest/client/v2_alpha/keys.py b/synapse/rest/client/v2_alpha/keys.py
index f99b53530a..6a3cfe84f8 100644
--- a/synapse/rest/client/v2_alpha/keys.py
+++ b/synapse/rest/client/v2_alpha/keys.py
@@ -193,7 +193,7 @@ class KeyChangesServlet(RestServlet):
         )
 
         defer.returnValue((200, {
-            "changed": changed
+            "changed": list(changed),
         }))