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-rw-r--r--synapse/http/client.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/http/client.py b/synapse/http/client.py
index 22b7145ac1..b53a07aa2d 100644
--- a/synapse/http/client.py
+++ b/synapse/http/client.py
@@ -143,7 +143,7 @@ class SimpleHttpClient(object):
             query_bytes = urllib.urlencode(args, True)
             uri = "%s?%s" % (uri, query_bytes)
 
-        json_str = json.dumps(json_body)
+        json_str = encode_canonical_json(json_body)
 
         response = yield self.agent.request(
             "PUT",