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-rw-r--r--synapse/storage/end_to_end_keys.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/storage/end_to_end_keys.py b/synapse/storage/end_to_end_keys.py
index 1f1721e820..2a0f6cfca9 100644
--- a/synapse/storage/end_to_end_keys.py
+++ b/synapse/storage/end_to_end_keys.py
@@ -40,7 +40,10 @@ class EndToEndKeyStore(SQLBaseStore):
                 allow_none=True,
             )
 
-            new_key_json = encode_canonical_json(device_keys)
+            # In py3 we need old_key_json to match new_key_json type. The DB
+            # returns unicode while encode_canonical_json returns bytes.
+            new_key_json = encode_canonical_json(device_keys).decode("utf-8")
+
             if old_key_json == new_key_json:
                 return False