diff --git a/six/modules/c++/cphd/source/CPHDWriter.cpp b/six/modules/c++/cphd/source/CPHDWriter.cpp
index 0cb94b0a7..f3f304885 100644
--- a/six/modules/c++/cphd/source/CPHDWriter.cpp
+++ b/six/modules/c++/cphd/source/CPHDWriter.cpp
@@ -162,6 +162,9 @@ static auto make_span(std::span<const std::byte> data, const cphd::Data::Support
     const auto pData = data.data() + dataArray.arrayByteOffset;
     return sys::make_span(pData, dataArray.size_bytes());
 }
+void CPHDWriter::writeSupportData(io::SeekableOutputStream& stream, std::span<const std::byte> data)
+{
+    const auto supportBlockByteOffset = mHeader.getSupportBlockByteOffset();
 
 sys::Off_T CPHDWriter::getSupportBlockByteOffset(const Data::SupportArray& dataArray) const
 {