diff --git a/synapse/events/__init__.py b/synapse/events/__init__.py
index f4ec8cd18c6bae9d81a92922fa90625acc2d5092..64e08223b0c9ba8b2a745cbd54d1187970b2393f 100644
--- a/synapse/events/__init__.py
+++ b/synapse/events/__init__.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from synapse.util.frozenutils import freeze, unfreeze
+from synapse.util.frozenutils import freeze
 
 
 class _EventInternalMetadata(object):
diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index 94603ef82677b70a6255add940778291d411ef71..a0284d54b9b671afb067e40b91283e7505dd4e32 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -44,7 +44,6 @@ from syutil.jsonutil import encode_canonical_json
 from synapse.crypto.event_signing import compute_event_reference_hash
 
 
-import simplejson as json
 import logging
 import os