diff --git a/piptools/utils.py b/piptools/utils.py
index 23bfa5a1..f9f099f3 100644
--- a/piptools/utils.py
+++ b/piptools/utils.py
@@ -726,7 +726,7 @@ def _invert_negative_bool_options_in_config(
         # Transform config key to its equivalent in the CLI
         long_option = _convert_to_long_option(key)
         new_key = cli_opts[long_option].name if long_option in cli_opts else key
-        if new_key.startswith('no_'):
+        if new_key.startswith("no_"):
             new_key = new_key[3:]
         assert new_key is not None