diff --git a/include/exiv2/bmffimage.hpp b/include/exiv2/bmffimage.hpp
index 786f57201b..d96ee2325f 100644
--- a/include/exiv2/bmffimage.hpp
+++ b/include/exiv2/bmffimage.hpp
@@ -13,6 +13,7 @@
 // *****************************************************************************
 // namespace extensions
 namespace Exiv2 {
+[[deprecated]]
 EXIV2API bool enableBMFF(bool enable = true);
 }  // namespace Exiv2