diff --git a/panoptica/metrics/metrics.py b/panoptica/metrics/metrics.py
index c7ce019..57432d7 100644
--- a/panoptica/metrics/metrics.py
+++ b/panoptica/metrics/metrics.py
@@ -292,9 +292,7 @@ def __init__(
         self.STD = (
             None
             if self.ALL is None
-            else empty_list_std
-            if len(self.ALL) == 0
-            else np.std(self.ALL)
+            else empty_list_std if len(self.ALL) == 0 else np.std(self.ALL)
         )
 
     def __getitem__(self, mode: MetricMode | str):