diff --git a/synapse/util/__init__.py b/synapse/util/__init__.py
index 5361cb7ec2..3ea431a7f9 100644
--- a/synapse/util/__init__.py
+++ b/synapse/util/__init__.py
@@ -13,6 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+
from twisted.internet import reactor
import time
diff --git a/synapse/util/async.py b/synapse/util/async.py
index e04db8e285..ebbdc00ae1 100644
--- a/synapse/util/async.py
+++ b/synapse/util/async.py
@@ -13,6 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+
from twisted.internet import defer, reactor
diff --git a/synapse/util/distributor.py b/synapse/util/distributor.py
index 32d19402b4..9605d7d1b9 100644
--- a/synapse/util/distributor.py
+++ b/synapse/util/distributor.py
@@ -12,6 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
from twisted.internet import defer
import logging
diff --git a/synapse/util/jsonobject.py b/synapse/util/jsonobject.py
index 190a80a322..e2840b59f9 100644
--- a/synapse/util/jsonobject.py
+++ b/synapse/util/jsonobject.py
@@ -13,6 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+
import copy
class JsonEncodedObject(object):
diff --git a/synapse/util/lockutils.py b/synapse/util/lockutils.py
index e4d609d84e..758be0b901 100644
--- a/synapse/util/lockutils.py
+++ b/synapse/util/lockutils.py
@@ -13,6 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+
from twisted.internet import defer
import logging
diff --git a/synapse/util/logutils.py b/synapse/util/logutils.py
index 08d5aafca4..9270a1790b 100644
--- a/synapse/util/logutils.py
+++ b/synapse/util/logutils.py
@@ -13,6 +13,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+
from inspect import getcallargs
import logging
diff --git a/synapse/util/stringutils.py b/synapse/util/stringutils.py
index 91550583a4..e1b0796e56 100644
--- a/synapse/util/stringutils.py
+++ b/synapse/util/stringutils.py
@@ -12,6 +12,7 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
import random
import string
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