diff --git a/include/boost/intrusive/detail/key_nodeptr_comp.hpp b/include/boost/intrusive/detail/key_nodeptr_comp.hpp
index bdc025e..1029a34 100644
--- a/include/boost/intrusive/detail/key_nodeptr_comp.hpp
+++ b/include/boost/intrusive/detail/key_nodeptr_comp.hpp
@@ -78,7 +78,7 @@ public:
       static const bool value = same_type || is_convertible<P1, const_node_ptr>::value;
    };
 
-   base_t base() const
+   BOOST_INTRUSIVE_FORCEINLINE base_t base() const
    {  return static_cast<const base_t&>(*this); }
 
    BOOST_INTRUSIVE_FORCEINLINE key_nodeptr_comp(KeyTypeKeyCompare kcomp, const ValueTraits *traits)