diff --git a/include/boost/function/function_base.hpp b/include/boost/function/function_base.hpp
index ad7bb99..5bf039e 100644
--- a/include/boost/function/function_base.hpp
+++ b/include/boost/function/function_base.hpp
@@ -350,7 +350,7 @@ namespace detail {
       return f->empty();
     }
 
-    inline bool has_empty_target(...)
+    inline bool has_empty_target(const void*)
     {
       return false;
     }