diff --git a/format.py b/format.py
index 5f607d8..735ff0f 100644
--- a/format.py
+++ b/format.py
@@ -4,7 +4,6 @@
 import re
 import os
 import tempfile
-import pathlib
 import platform
 
 SETTINGS_PATH = 'Default.sublime-settings'
@@ -187,7 +186,7 @@ def run(self, edit, formatBuffer=True):
     if bscExe == None:
       return
 
-    extension = pathlib.Path(filename).suffix
+    _, extension = os.path.splitext(filename)
     formattedResult = formatUsingValidBscPath(
       code,
       bscExe,