diff --git a/include/boost/smart_ptr/enable_shared_from_raw.hpp b/include/boost/smart_ptr/enable_shared_from_raw.hpp
index 669a649..5cd3574 100644
--- a/include/boost/smart_ptr/enable_shared_from_raw.hpp
+++ b/include/boost/smart_ptr/enable_shared_from_raw.hpp
@@ -104,7 +104,7 @@ private:
     }
 
     // Note: invoked automatically by shared_ptr; do not call
-    template<class X, class Y> void _internal_accept_owner( shared_ptr<X> * ppx, Y * py ) const
+    template<class X, class Y> void _internal_accept_owner( shared_ptr<X> * ppx, Y * ) const
     {
         BOOST_ASSERT( ppx != 0 );
 
diff --git a/include/boost/smart_ptr/intrusive_ref_counter.hpp b/include/boost/smart_ptr/intrusive_ref_counter.hpp
index 82fa8bc..b7587ea 100644
--- a/include/boost/smart_ptr/intrusive_ref_counter.hpp
+++ b/include/boost/smart_ptr/intrusive_ref_counter.hpp
@@ -83,7 +83,7 @@ struct thread_safe_counter
 
     static unsigned int decrement(boost::detail::atomic_count& counter) BOOST_NOEXCEPT
     {
-        return --counter;
+        return static_cast< unsigned int >(--counter);
     }
 };