diff --git a/scripts/aggregate_dataset_histos.py b/scripts/aggregate_dataset_histos.py
index 0724a8e..75841f1 100644
--- a/scripts/aggregate_dataset_histos.py
+++ b/scripts/aggregate_dataset_histos.py
@@ -146,7 +146,7 @@ def _main(args: argparse.Namespace) -> None:
     for histo in agg_histograms.values():
         histo.update(
             {
-                "bin_values": [x / histo["_sample_count"] for x in histo["bin_values"]],
+                "bin_values": [x / histo["_sample_count"] for x in histo["bin_values"]],  # type: ignore=attr-defined
             }
         )