diff --git a/patacrep/encoding.py b/patacrep/encoding.py
index 189db9a3..1ed15b94 100644
--- a/patacrep/encoding.py
+++ b/patacrep/encoding.py
@@ -38,7 +38,7 @@ def detect_encoding(filename):
             pass
         else:
             if encoding != 'utf-8':
-                LOGGER.info('Opening `%s` with `%s` encoding' % (filename, encoding))
+                LOGGER.info('Opening `{}` with `{}` encoding'.format(filename, encoding))
             return encoding
         finally:
             filehandler.close()