diff --git a/synapse/rest/client/v2_alpha/sync.py b/synapse/rest/client/v2_alpha/sync.py
index 0f8411f87f..e20a9ef317 100644
--- a/synapse/rest/client/v2_alpha/sync.py
+++ b/synapse/rest/client/v2_alpha/sync.py
@@ -101,6 +101,8 @@ class SyncRestServlet(RestServlet):
 
         since = body.get("since", None)
 
+        logger.info("Since: %r", since)
+
         extras = body.get("extras", {})
         extras = SyncExtras(
             paginate=extras.get("paginate", {}),
@@ -175,6 +177,8 @@ class SyncRestServlet(RestServlet):
             extras=extras,
         )
 
+        logger.info("next_batch: %r", sync_result[1]["next_batch"])
+
         defer.returnValue(sync_result)
 
     @defer.inlineCallbacks
diff --git a/synapse/types.py b/synapse/types.py
index cfd3e7328b..f0ad527bc0 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -18,7 +18,7 @@ from synapse.api.errors import SynapseError
 from collections import namedtuple
 
 from unpaddedbase64 import encode_base64, decode_base64
-import ujson as msgpack
+import msgpack
 
 
 Requester = namedtuple("Requester", ["user", "access_token_id", "is_guest"])