diff --git a/slackblocks/elements.py b/slackblocks/elements.py
index fc5bd58..386ba06 100644
--- a/slackblocks/elements.py
+++ b/slackblocks/elements.py
@@ -526,7 +526,9 @@ def __init__(
         if (
             option_groups
             and self.initial_options
-            and not all(isinstance(option, OptionGroup) for option in self.initial_options)
+            and not all(
+                isinstance(option, OptionGroup) for option in self.initial_options
+            )
         ):
             raise InvalidUsageError(
                 "If using `option_groups` then `initial_options` must also be of type "