diff --git a/src/blackmisc/tuple_private.h b/src/blackmisc/tuple_private.h
index 5cf3ce03f..8afa2eaae 100644
--- a/src/blackmisc/tuple_private.h
+++ b/src/blackmisc/tuple_private.h
@@ -29,23 +29,6 @@ namespace BlackMisc
     template <class> class TupleConverter;
     template <class Derived, class Base = CEmpty> class CValueObject;
 
-    //! Traits class to test whether a class template specialization is a base class of another class.
-    template <template <class...> class Base, class Derived>
-    class TemplateIsBaseOf
-    {
-        struct yes { char x; };
-        struct no { yes x[2]; };
-        template <class... Ts> static yes test(const Base<Ts...> &);
-        static no test(...);
-
-    public:
-        //! True if and only if Derived is derived from a specialization of Base.
-        static const bool value = sizeof(test(std::declval<Derived>())) == sizeof(yes);
-
-        //! std::true_type or std::false_type.
-        using type = std::integral_constant<bool, value>;
-    };
-
     namespace Private
     {