diff --git a/six/modules/c++/cphd/include/cphd/Wideband.h b/six/modules/c++/cphd/include/cphd/Wideband.h
index f02d8d000..95e5d4ec9 100644
--- a/six/modules/c++/cphd/include/cphd/Wideband.h
+++ b/six/modules/c++/cphd/include/cphd/Wideband.h
@@ -279,7 +279,7 @@ class Wideband
               size_t lastSample,
               size_t numThreads,
               const types::RowCol<size_t>& dims,
-              void* data)
+              void* data) const
     {
         const mem::BufferView<sys::ubyte> buffer(static_cast<sys::ubyte*>(data),
                                                  dims.area() * mElementSize);