diff --git a/include/boost/python/def.hpp b/include/boost/python/def.hpp
index 1c77736d..d0db5528 100644
--- a/include/boost/python/def.hpp
+++ b/include/boost/python/def.hpp
@@ -80,6 +80,7 @@ namespace detail
   template <class T>
   object make_function1(T fn, ...) { return make_function(fn); }
 
+  inline
   object make_function1(object const& x, object const*) { return x; }
 }