diff --git a/src/HHbbVV/processors/bbVVSkimmer.py b/src/HHbbVV/processors/bbVVSkimmer.py
index d02213be..e0c4f6df 100644
--- a/src/HHbbVV/processors/bbVVSkimmer.py
+++ b/src/HHbbVV/processors/bbVVSkimmer.py
@@ -628,8 +628,8 @@ def process(self, events: ak.Array):
 
             if self._systematics:
                 systematics += list(weights.variations)
-            
-            single_weight_pileup = weights.partial_weight(['single_weight_pileup'])
+
+            single_weight_pileup = weights.partial_weight(["single_weight_pileup"])
             add_selection("single_weight_pileup", (single_weight_pileup <= 4), *selection_args)
 
             # TODO: need to be careful about the sum of gen weights used for the LHE/QCDScale uncertainties