--- libs/fiber/src/numa/windows/pin_thread.cpp
+++ libs/fiber/src/numa/windows/pin_thread.cpp
@@ -23,7 +23,7 @@
 
 BOOST_FIBERS_DECL
 void pin_thread( std::uint32_t cpuid) {
-    pin_thread( cpuid, ::GetCurrentThread() );
+    pin_thread( cpuid, reinterpret_cast< std::thread::native_handle_type >(::GetCurrentThread()));
 }
 
 BOOST_FIBERS_DECL
@@ -37,7 +37,7 @@
     uint32_t id = cpuid % 64; 
     // set the bit mask of the logical CPU
     affinity.Mask = static_cast< KAFFINITY >( 1) << id;
-    if ( BOOST_UNLIKELY( 0 == ::SetThreadGroupAffinity( h, & affinity, nullptr) ) ) {
+    if ( BOOST_UNLIKELY( 0 == ::SetThreadGroupAffinity( reinterpret_cast< HANDLE >(h), & affinity, nullptr) ) ) {
         throw std::system_error(
                 std::error_code( ::GetLastError(), std::system_category() ),
                 "::SetThreadiGroupAffinity() failed");