diff --git a/edbob/filemon_server.py b/edbob/filemon_server.py
index 881c7b1..8071a51 100644
--- a/edbob/filemon_server.py
+++ b/edbob/filemon_server.py
@@ -109,7 +109,7 @@ class FileMonitorService(win32serviceutil.ServiceFramework):
         while not file_is_free(path):
             # TODO: Add configurable timeout so long-open files can't hijack
             # our prcessing.
-            time.sleep(0.25)
+            win32api.SleepEx(250, True)
         for action in self.monitored[key].actions:
             if isinstance(action, tuple):
                 func = action[0]