diff --git a/youtube_dl/archive.py b/youtube_dl/archive.py
index 13106277b..e7940b9db 100644
--- a/youtube_dl/archive.py
+++ b/youtube_dl/archive.py
@@ -1,9 +1,7 @@
 #!/usr/bin/env python
 # coding: utf-8
 import errno
-import os
 
-from youtube_dl.compat import compat_st_mtime
 from youtube_dl.utils import locked_file
 
 
diff --git a/youtube_dl/compat.py b/youtube_dl/compat.py
index 3172b5105..2f43d987c 100644
--- a/youtube_dl/compat.py
+++ b/youtube_dl/compat.py
@@ -2978,14 +2978,6 @@ else:
         return ctypes.WINFUNCTYPE(*args, **kwargs)
 
 
-def compat_st_mtime(path):
-    """ Py3 has nanosecond accuracy on modification time of file """
-    try:
-        return os.stat(path).st_mtime_ns
-    except ImportError:
-        return os.stat(path).st_mtime
-
-
 __all__ = [
     'compat_HTMLParseError',
     'compat_HTMLParser',