diff --git a/imap_filter/imap_filter.py b/imap_filter/imap_filter.py
index 3083d10..f7e9776 100644
--- a/imap_filter/imap_filter.py
+++ b/imap_filter/imap_filter.py
@@ -186,7 +186,7 @@ class ImapFilter:
             content += 'require ["fileinto"];'
         for mfilter in filters:
             self._log.debug(
-                'Adding filter '%s' to sieve script',
+                "Adding filter '%s' to sieve script",
                 mfilter['name']
             )
             if 'field' in mfilter: