diff --git a/lib/tfw/networking/controller_connector.py b/lib/tfw/networking/controller_connector.py
index 64f83b2..dcafa70 100644
--- a/lib/tfw/networking/controller_connector.py
+++ b/lib/tfw/networking/controller_connector.py
@@ -3,7 +3,7 @@ from zmq.eventloop import ioloop
 from zmq.eventloop.zmqstream import ZMQStream
 
 from tfw.config import tfwenv
-from tfw.util import ZMQConnectorBase
+from tfw.networking.zmq_connector_base import ZMQConnectorBase
 
 ioloop.install()
 
diff --git a/lib/tfw/networking/event_handlers/server_connector.py b/lib/tfw/networking/event_handlers/server_connector.py
index 700468a..d15d467 100644
--- a/lib/tfw/networking/event_handlers/server_connector.py
+++ b/lib/tfw/networking/event_handlers/server_connector.py
@@ -4,7 +4,7 @@ from zmq.eventloop.zmqstream import ZMQStream
 
 from tfw.networking.serialization import serialize_all
 from tfw.config import tfwenv
-from tfw.util import ZMQConnectorBase
+from tfw.networking.zmq_connector_base import ZMQConnectorBase
 
 
 class ServerDownlinkConnector(ZMQConnectorBase):
diff --git a/lib/tfw/networking/server/event_handler_connector.py b/lib/tfw/networking/server/event_handler_connector.py
index 310ad28..a5149f3 100644
--- a/lib/tfw/networking/server/event_handler_connector.py
+++ b/lib/tfw/networking/server/event_handler_connector.py
@@ -5,7 +5,7 @@ from tfw.networking.serialization import serialize_all
 from tfw.config import tfwenv
 from tfw.config.logs import logging
 log = logging.getLogger(__name__)
-from tfw.util import ZMQConnectorBase
+from tfw.networking.zmq_connector_base import ZMQConnectorBase
 
 
 class EventHandlerDownlinkConnector(ZMQConnectorBase):
diff --git a/lib/tfw/networking/solvable_connector.py b/lib/tfw/networking/solvable_connector.py
index 7a77a57..a207a21 100644
--- a/lib/tfw/networking/solvable_connector.py
+++ b/lib/tfw/networking/solvable_connector.py
@@ -2,7 +2,7 @@ import zmq
 from zmq.eventloop import ioloop
 
 from tfw.config import tfwenv
-from tfw.util import ZMQConnectorBase
+from tfw.networking.zmq_connector_base import ZMQConnectorBase
 from tfw.networking.serialization import serialize_all, deserialize_all
 
 ioloop.install()
diff --git a/lib/tfw/networking/zmq_connector_base.py b/lib/tfw/networking/zmq_connector_base.py
new file mode 100644
index 0000000..c4c838a
--- /dev/null
+++ b/lib/tfw/networking/zmq_connector_base.py
@@ -0,0 +1,6 @@
+import zmq
+
+
+class ZMQConnectorBase:
+    def __init__(self, zmq_context=None):
+        self._zmq_context = zmq_context or zmq.Context.instance()
diff --git a/lib/tfw/util.py b/lib/tfw/util.py
index 7ee99cc..4c53d4e 100644
--- a/lib/tfw/util.py
+++ b/lib/tfw/util.py
@@ -1,4 +1,4 @@
-import xmlrpc.client, zmq
+import xmlrpc.client
 from contextlib import suppress
 from xmlrpc.client import Fault as SupervisorFault
 from time import time, sleep
@@ -30,11 +30,6 @@ class SupervisorMixin:
         self.start_process()
 
 
-class ZMQConnectorBase:
-    def __init__(self, zmq_context=None):
-        self._zmq_context = zmq_context or zmq.Context.instance()
-
-
 class RateLimiter:
     def __init__(self, rate_per_second):
         self.min_interval = 1 / float(rate_per_second)