diff --git a/plugins/draco/io/DracoReader.cpp b/plugins/draco/io/DracoReader.cpp
index 7cab73d528..7a6474a82d 100644
--- a/plugins/draco/io/DracoReader.cpp
+++ b/plugins/draco/io/DracoReader.cpp
@@ -242,7 +242,7 @@ point_count_t DracoReader::read(PointViewPtr view, point_count_t count)
     {
         for (auto& dim: m_dimensions)
         {
-            const uint8_t *src = dim.attr->GetAddressOfMappedIndex(draco::PointIndex(numRead)) +
+            const uint8_t *src = dim.attr->GetAddressOfMappedIndex(draco::PointIndex((uint32_t)numRead)) +
                 draco::DataTypeLength(dim.attr->data_type()) * dim.attNum;
             view->setField(dim.pdalId, dim.pdalType, id, src);
         }
diff --git a/plugins/draco/io/DracoWriter.cpp b/plugins/draco/io/DracoWriter.cpp
index 655d4a5fd3..715ea536ea 100644
--- a/plugins/draco/io/DracoWriter.cpp
+++ b/plugins/draco/io/DracoWriter.cpp
@@ -332,17 +332,17 @@ void DracoWriter::initPointCloud(point_count_t size)
 
 void DracoWriter::addPoint(DimensionInfo dim, PointRef &point, PointId idx)
 {
-    const auto pointId = draco::PointIndex(idx);
+    const auto pointId = draco::PointIndex((uint32_t)idx);
 
     //find data type and create buffer
     Dimension::Type dataType = dim.pdalDims[0].m_type;
     size_t size = Dimension::size(dataType) * dim.pdalDims.size();
-    char buffer [size];
+    std::vector<char> buffer(size, 0);
     //fill buffer
-    point.getPackedData(dim.pdalDims, buffer);
+    point.getPackedData(dim.pdalDims, buffer.data());
     //add to draco pointcloud
     draco::PointAttribute *const att = m_pc->attribute(dim.attId);
-    att->SetAttributeValue(att->mapped_index(pointId), &buffer);
+    att->SetAttributeValue(att->mapped_index(pointId), buffer.data());
 }
 
 void DracoWriter::write(const PointViewPtr view)