diff --git a/tiledb/sm/query/readers/dense_reader.cc b/tiledb/sm/query/readers/dense_reader.cc
index df18d001bd9..501cdd5b4ad 100644
--- a/tiledb/sm/query/readers/dense_reader.cc
+++ b/tiledb/sm/query/readers/dense_reader.cc
@@ -1319,13 +1319,6 @@ Status DenseReader::process_aggregates(
   const auto& tile_coords = subarray.tile_coords();
   const auto global_order = layout_ == Layout::GLOBAL_ORDER;
 
-  std::vector<uint8_t> aggregate_bitmap;
-  if (condition_.has_value()) {
-    aggregate_bitmap = qc_result;
-  } else {
-    aggregate_bitmap.resize(subarray.cell_num(), 1);
-  }
-
   // Process values in parallel.
   auto status = parallel_for_2d(
       storage_manager_->compute_tp(),
@@ -1358,7 +1351,7 @@ Status DenseReader::process_aggregates(
               tile_subarrays[t],
               global_order ? tile_offsets[t] : 0,
               range_info,
-              aggregate_bitmap,
+              qc_result,
               range_thread_idx,
               num_range_threads));
         }
@@ -1863,7 +1856,7 @@ Status DenseReader::aggregate_tiles(
     const Subarray& tile_subarray,
     const uint64_t global_cell_offset,
     const std::vector<RangeInfo<DimType>>& range_info,
-    std::vector<uint8_t>& aggregate_bitmap,
+    const std::vector<uint8_t>& qc_result,
     const uint64_t range_thread_idx,
     const uint64_t num_range_threads) {
   // For easy reference
@@ -1909,6 +1902,14 @@ Status DenseReader::aggregate_tiles(
       cell_offset = iter.dest_offset_row_col();
     }
 
+    std::vector<uint8_t> aggregate_bitmap(iter.cell_slab_length(), 1);
+    if (condition_.has_value()) {
+      memcpy(
+          aggregate_bitmap.data(),
+          qc_result.data() + cell_offset,
+          iter.cell_slab_length());
+    }
+
     // Iterate through all fragment domains and copy data.
     for (uint64_t fd = 0; fd < frag_domains.size(); fd++) {
       // If the cell slab overlaps this fragment domain range, copy data.
@@ -1936,7 +1937,7 @@ Status DenseReader::aggregate_tiles(
               iter.pos_in_tile() + start,
               iter.pos_in_tile() + end + 1,
               tile_tuples[fd],
-              &aggregate_bitmap[cell_offset + start])};
+              aggregate_bitmap.data() + start)};
           for (auto& aggregate : aggregates) {
             aggregate->aggregate_data(aggregate_buffer);
           }
@@ -1952,7 +1953,7 @@ Status DenseReader::aggregate_tiles(
                 start_cell,
                 start_cell + 1,
                 tile_tuples[fd],
-                &aggregate_bitmap[cell_offset + start + i])};
+                aggregate_bitmap.data() + start + i)};
             for (auto& aggregate : aggregates) {
               aggregate->aggregate_data(aggregate_buffer);
             }
@@ -1964,7 +1965,7 @@ Status DenseReader::aggregate_tiles(
         // fragments.
         if (fd != frag_domains.size() - 1) {
           for (uint64_t c = start; c <= end; c++) {
-            aggregate_bitmap[cell_offset + c] = 0;
+            aggregate_bitmap[c] = 0;
           }
         }
 
diff --git a/tiledb/sm/query/readers/dense_reader.h b/tiledb/sm/query/readers/dense_reader.h
index 8560171edec..16c997299ac 100644
--- a/tiledb/sm/query/readers/dense_reader.h
+++ b/tiledb/sm/query/readers/dense_reader.h
@@ -400,7 +400,7 @@ class DenseReader : public ReaderBase, public IQueryStrategy {
       const Subarray& tile_subarray,
       const uint64_t global_cell_offset,
       const std::vector<RangeInfo<DimType>>& range_info,
-      std::vector<uint8_t>& aggregate_bitmap,
+      const std::vector<uint8_t>& qc_result,
       const uint64_t range_thread_idx,
       const uint64_t num_range_threads);