diff --git a/src/common/vector/auxiliary_buffer.cpp b/src/common/vector/auxiliary_buffer.cpp
index 4904a50b27..a31d6f3ca1 100644
--- a/src/common/vector/auxiliary_buffer.cpp
+++ b/src/common/vector/auxiliary_buffer.cpp
@@ -52,7 +52,8 @@ void ListAuxiliaryBuffer::resizeDataVector(ValueVector* dataVector) {
     auto buffer = std::make_unique<uint8_t[]>(capacity * dataVector->getNumBytesPerValue());
     memcpy(buffer.get(), dataVector->valueBuffer.get(), size * dataVector->getNumBytesPerValue());
     dataVector->valueBuffer = std::move(buffer);
-    dataVector->nullMask->resize(capacity); // note: allocating 64 times what is needed
+    dataVector->nullMask->resize((capacity + NullMask::NUM_BITS_PER_NULL_ENTRY - 1) >>
+                                 NullMask::NUM_BITS_PER_NULL_ENTRY_LOG2);
     // If the dataVector is a struct vector, we need to resize its field vectors.
     if (dataVector->dataType.getPhysicalType() == PhysicalTypeID::STRUCT) {
         resizeStructDataVector(dataVector);