Index: detail/config.hpp
===================================================================
--- detail/config.hpp	(revision 77339)
+++ detail/config.hpp	(working copy)
@@ -28,18 +28,16 @@
 #if defined(BOOST_ASIO_HEADER_ONLY)
 # define BOOST_ASIO_DECL inline
 #else // defined(BOOST_ASIO_HEADER_ONLY)
-# if defined(BOOST_HAS_DECLSPEC)
 // We need to import/export our code only if the user has specifically asked
 // for it by defining BOOST_ASIO_DYN_LINK.
-#  if defined(BOOST_ASIO_DYN_LINK)
+# if defined(BOOST_ASIO_DYN_LINK)
 // Export if this is our own source, otherwise import.
-#   if defined(BOOST_ASIO_SOURCE)
-#    define BOOST_ASIO_DECL __declspec(dllexport)
-#   else // defined(BOOST_ASIO_SOURCE)
-#    define BOOST_ASIO_DECL __declspec(dllimport)
-#   endif // defined(BOOST_ASIO_SOURCE)
-#  endif // defined(BOOST_ASIO_DYN_LINK)
-# endif // defined(BOOST_HAS_DECLSPEC)
+#  if defined(BOOST_ASIO_SOURCE)
+#   define BOOST_ASIO_DECL BOOST_SYMBOL_EXPORT
+#  else // defined(BOOST_ASIO_SOURCE)
+#   define BOOST_ASIO_DECL BOOST_SYMBOL_IMPORT
+#  endif // defined(BOOST_ASIO_SOURCE)
+# endif // defined(BOOST_ASIO_DYN_LINK)
 #endif // defined(BOOST_ASIO_HEADER_ONLY)
 
 // If BOOST_ASIO_DECL isn't defined yet define it now.
Index: io_service.hpp
===================================================================
--- io_service.hpp	(revision 77339)
+++ io_service.hpp	(working copy)
@@ -672,7 +672,7 @@
 };
 
 /// Base class for all io_service services.
-class io_service::service
+class BOOST_ASIO_DECL io_service::service
   : private noncopyable
 {
 public: