diff --git a/include/boost/smart_ptr/detail/yield_k.hpp b/include/boost/smart_ptr/detail/yield_k.hpp
index c3d0450..44d1836 100644
--- a/include/boost/smart_ptr/detail/yield_k.hpp
+++ b/include/boost/smart_ptr/detail/yield_k.hpp
@@ -60,10 +60,15 @@ namespace detail
 {
 
 #if !defined( BOOST_USE_WINDOWS_H ) && !BOOST_PLAT_WINDOWS_RUNTIME
-#if BOOST_COMP_CLANG
-  extern "C" __declspec(dllimport) void __stdcall Sleep( unsigned long ms );
-#else
+#if !BOOST_COMP_CLANG || !defined __MINGW32__
   extern "C" void __stdcall Sleep( unsigned long ms );
+#else
+#include <_mingw.h>
+#if !defined __MINGW64_VERSION_MAJOR
+  extern "C" void __stdcall Sleep( unsigned long ms );
+#else
+  extern "C" __declspec(dllimport) void __stdcall Sleep( unsigned long ms );
+#endif
 #endif
 #endif