From 9af55d30cf9011f8117ca57801fd66fc1b34bb5c Mon Sep 17 00:00:00 2001
From: Giulio Eulisse <10544+ktf@users.noreply.github.com>
Date: Tue, 4 Mar 2025 10:37:30 +0100
Subject: [PATCH] DPL: use correct size for the buffer

---
 Framework/AnalysisSupport/src/TTreePlugin.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Framework/AnalysisSupport/src/TTreePlugin.cxx b/Framework/AnalysisSupport/src/TTreePlugin.cxx
index f74fcda38d1f0..4481c06a8c6d9 100644
--- a/Framework/AnalysisSupport/src/TTreePlugin.cxx
+++ b/Framework/AnalysisSupport/src/TTreePlugin.cxx
@@ -702,7 +702,7 @@ arrow::Result<arrow::RecordBatchGenerator> TTreeFileFormat::ScanBatchesAsync(
       if ((datasetField->type() == arrow::boolean())) {
         valueOp.kind = ReadOpKind::Booleans;
         valueOp.listSize = 1;
-        valueOp.targetBuffer = treeFragment->GetPlaceholderForOp((valueOp.rootBranchEntries) / 8 + 1);
+        valueOp.targetBuffer = treeFragment->GetPlaceholderForOp((valueOp.rootBranchEntries + 7) / 8);
       } else if (listType && datasetField->type()->field(0)->type() == arrow::boolean()) {
         valueOp.typeSize = physicalField->type()->field(0)->type()->byte_width();
         valueOp.listSize = listType->list_size();