1 files changed, 9 insertions, 1 deletions
diff --git a/crypto/async/arch/async_win.h b/crypto/async/arch/async_win.h
index 87e661d766..eb61b032e0 100644
--- a/crypto/async/arch/async_win.h
+++ b/crypto/async/arch/async_win.h
@@ -26,8 +26,16 @@ typedef struct async_fibre_st {
 
 # define async_fibre_swapcontext(o,n,r) \
         (SwitchToFiber((n)->fibre), 1)
-# define async_fibre_makecontext(c) \
+
+# if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600
+#   define async_fibre_makecontext(c) \
+        ((c)->fibre = CreateFiberEx(0, 0, FIBER_FLAG_FLOAT_SWITCH, \
+                                    async_start_func_win, 0))
+# else
+#   define async_fibre_makecontext(c) \
         ((c)->fibre = CreateFiber(0, async_start_func_win, 0))
+# endif
+
 # define async_fibre_free(f)             (DeleteFiber((f)->fibre))
 
 int async_fibre_init_dispatcher(async_fibre *fibre);