diff --git a/libheif/CMakeLists.txt b/libheif/CMakeLists.txt
index 6d683ec..dc2c4eb 100644
--- a/libheif/CMakeLists.txt
+++ b/libheif/CMakeLists.txt
@@ -17,6 +17,7 @@ set(libheif_headers
     heif_plugin_registry.h
     heif_limits.h
     heif_plugin.h
+    heif_cxx.h
     logging.h
     ${CMAKE_CURRENT_BINARY_DIR}/heif_version.h
 )
