diff --git a/src/spikeinterface/widgets/unit_summary.py b/src/spikeinterface/widgets/unit_summary.py
index fd7dafd5d6..652c0f841f 100644
--- a/src/spikeinterface/widgets/unit_summary.py
+++ b/src/spikeinterface/widgets/unit_summary.py
@@ -62,7 +62,9 @@ def __init__(
             subwidget_kwargs = dict()
         for kwargs in subwidget_kwargs.values():
             if "unit_colors" in kwargs:
-                raise ValueError("unit_colors should not be set in subwidget_kwargs, but directly as a parameter of plot_unit_summary")
+                raise ValueError(
+                    "unit_colors should not be set in subwidget_kwargs, but directly as a parameter of plot_unit_summary"
+                )
 
         plot_data = dict(
             sorting_analyzer=sorting_analyzer,