diff --git a/lib/tfw/components/history_monitor.py b/lib/tfw/components/history_monitor.py
index 395149d..f07a57b 100644
--- a/lib/tfw/components/history_monitor.py
+++ b/lib/tfw/components/history_monitor.py
@@ -1,11 +1,11 @@
 from watchdog.observers import Observer
-from watchdog.events import FileSystemEventHandler
+from watchdog.events import PatternMatchingEventHandler
 from os.path import dirname
 
 
-class CallbackEventHandler(FileSystemEventHandler):
-    def __init__(self, *callbacks):
-        super().__init__()
+class CallbackEventHandler(PatternMatchingEventHandler):
+    def __init__(self, files, *callbacks):
+        super().__init__(files)
         self.callbacks = callbacks
 
     def on_modified(self, event):
@@ -20,7 +20,8 @@ class HistoryMonitor:
         self._last_length = len(self._history)
         self._callbacks = []
         self.observer = Observer()
-        self.observer.schedule(CallbackEventHandler(self._fetch_history,
+        self.observer.schedule(CallbackEventHandler([self.histfile],
+                                                    self._fetch_history,
                                                     self._invoke_callbacks),
                                dirname(self.histfile))