diff --git a/CMakeLists_files.cmake b/CMakeLists_files.cmake
index 97e1d082..e7871040 100644
--- a/CMakeLists_files.cmake
+++ b/CMakeLists_files.cmake
@@ -404,4 +404,5 @@ list (APPEND PUBLIC_HEADER_FILES
 	opm/core/wells/WellCollection.hpp
 	opm/core/wells/WellsGroup.hpp
 	opm/core/wells/WellsManager.hpp
+	opm/core/wells/WellsManager_impl.hpp
 	)