diff --git a/include/boost/shared_ptr.hpp b/include/boost/shared_ptr.hpp
index ae89ecc..0a3bf6d 100644
--- a/include/boost/shared_ptr.hpp
+++ b/include/boost/shared_ptr.hpp
@@ -82,12 +82,12 @@ template<> struct shared_ptr_traits<void const volatile>
 
 // enable_shared_from_this support
 
-template<class T, class Y> void sp_enable_shared_from_this(boost::enable_shared_from_this<T> const * pe, Y const * px, shared_count const & pn)
+template<class T, class Y> void sp_enable_shared_from_this( shared_count const & pn, boost::enable_shared_from_this<T> const * pe, Y const * px )
 {
     if(pe != 0) pe->_internal_weak_this._internal_assign(const_cast<Y*>(px), pn);
 }
 
-inline void sp_enable_shared_from_this(void const volatile *, void const volatile *, shared_count const &)
+inline void sp_enable_shared_from_this( shared_count const & /*pn*/, ... )
 {
 }
 
@@ -123,7 +123,7 @@ public:
     template<class Y>
     explicit shared_ptr(Y * p): px(p), pn(p, checked_deleter<Y>()) // Y must be complete
     {
-        detail::sp_enable_shared_from_this(p, p, pn);
+        detail::sp_enable_shared_from_this( pn, p, p );
     }
 
     //
@@ -134,7 +134,7 @@ public:
 
     template<class Y, class D> shared_ptr(Y * p, D d): px(p), pn(p, d)
     {
-        detail::sp_enable_shared_from_this(p, p, pn);
+        detail::sp_enable_shared_from_this( pn, p, p );
     }
 
 //  generated copy constructor, assignment, destructor are fine...
@@ -198,7 +198,7 @@ public:
     {
         Y * tmp = r.get();
         pn = detail::shared_count(r);
-        detail::sp_enable_shared_from_this(tmp, tmp, pn);
+        detail::sp_enable_shared_from_this( pn, tmp, tmp );
     }
 
 #endif