diff --git a/lib/tfw/components/process_managing_event_handler.py b/lib/tfw/components/process_managing_event_handler.py
index c05416c..d23fe5b 100644
--- a/lib/tfw/components/process_managing_event_handler.py
+++ b/lib/tfw/components/process_managing_event_handler.py
@@ -13,7 +13,7 @@ class ProcessManager(SupervisorMixin):
         self.commands[command]()
 
 
-class ProcessManagingEventHandler(EventHandlerBase, SupervisorMixin):
+class ProcessManagingEventHandler(EventHandlerBase):
     def __init__(self, anchor, supervisor_process_name):
         super().__init__(anchor)
         self.processmanager = ProcessManager(supervisor_process_name)