diff --git a/tests/scripts/check_files.py b/tests/scripts/check_files.py
index 68871efe40..31edf8b61c 100755
--- a/tests/scripts/check_files.py
+++ b/tests/scripts/check_files.py
@@ -10,10 +10,10 @@ trailing whitespace, and presence of UTF-8 BOM.
 Note: requires python 3, must be run from Mbed TLS root.
 """
 
-import os
 import argparse
-import logging
 import codecs
+import logging
+import os
 import re
 import subprocess
 import sys