diff --git a/opm/core/wells/WellsManager_impl.hpp b/opm/core/wells/WellsManager_impl.hpp
index 03ad28133..3b6aedf4d 100644
--- a/opm/core/wells/WellsManager_impl.hpp
+++ b/opm/core/wells/WellsManager_impl.hpp
@@ -94,7 +94,7 @@ getCubeDim(const C2F& c2f,
 
     return cube;
 }
-} // end namespace
+} // end namespace WellsManagerDetail
 
 namespace Opm
 {