1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/rest/client/transactions.py b/synapse/rest/client/transactions.py
index 511e96ab00..48c17f1b6d 100644
--- a/synapse/rest/client/transactions.py
+++ b/synapse/rest/client/transactions.py
@@ -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