1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/rest/client/transactions.py b/synapse/rest/client/transactions.py
index 00b1b3066e..48c17f1b6d 100644
--- a/synapse/rest/client/transactions.py
+++ b/synapse/rest/client/transactions.py
@@ -17,7 +17,7 @@
 to ensure idempotency when performing PUTs using the REST API."""
 import logging
 
-from synapse.util.async import ObservableDeferred
+from synapse.util.async_helpers import ObservableDeferred
 from synapse.util.logcontext import make_deferred_yieldable, run_in_background
 
 logger = logging.getLogger(__name__)
@@ -53,7 +53,7 @@ class HttpTransactionCache(object):
             str: A transaction key
         """
         token = self.auth.get_access_token_from_request(request)
-        return request.path + "/" + token
+        return request.path.decode('utf8') + "/" + token
 
     def fetch_or_execute_request(self, request, fn, *args, **kwargs):
         """A helper function for fetch_or_execute which extracts