diff --git a/overlays/getmail6/getmail-read-exec-from-path.patch b/overlays/getmail6/getmail-read-exec-from-path.patch
index 6a9455d..a85ab36 100644
--- a/overlays/getmail6/getmail-read-exec-from-path.patch
+++ b/overlays/getmail6/getmail-read-exec-from-path.patch
@@ -34,7 +34,7 @@ index 2d25558..d7adeba 100755
 +        # if not os.access(self.conf['path'], os.X_OK):
 +        #     raise getmailConfigurationError('%s not executable'
 +        #                                     % self.conf['path'])
-         if type(self.conf['arguments']) != tuple:
+         if not isinstance(self.conf['arguments'], tuple):
              raise getmailConfigurationError(
                  'incorrect arguments format; see documentation (%s)'
 diff --git a/getmailcore/filters.py b/getmailcore/filters.py