diff --git a/lib/tfw/networking/server/tfw_server.py b/lib/tfw/networking/server/tfw_server.py
index 2644ad1..a3882d5 100644
--- a/lib/tfw/networking/server/tfw_server.py
+++ b/lib/tfw/networking/server/tfw_server.py
@@ -1,4 +1,5 @@
 from tornado.web import Application
+from collections import defaultdict
 
 from tfw.networking.server.controller_responder import ControllerResponder
 from tfw.networking.server.zmq_websocket_handler import ZMQWebSocketProxy
@@ -39,26 +40,19 @@ class TFWServer:
 class FSMManager:
     def __init__(self, fsm_type):
         self.fsm = fsm_type()
-        self.trigger_handlers = {}
+        self.trigger_handlers = defaultdict(list)
 
     def trigger(self, trigger):
-        self._prepare_handlerlist(trigger)
         if all((handler() for handler in self.trigger_handlers[trigger])):
             try: self.fsm.trigger(trigger, message='')
             except AttributeError: log.debug('FSM failed to execute nonexistent trigger: "{}"'.format(trigger))
 
     def subscribe_handler(self, trigger, handler):
-        self._prepare_handlerlist(trigger)
         self.trigger_handlers[trigger].append(handler)
 
     def unsubscribe_handler(self, trigger, handler):
-        self._prepare_handlerlist(trigger)
         self.trigger_handlers[trigger].append(handler)
 
-    def _prepare_handlerlist(self, trigger):
-        try: self.trigger_handlers[trigger]
-        except KeyError: self.trigger_handlers[trigger] = []
-
 
 class FSMUpdater:
     def __init__(self, fsm):