1 files changed, 4 insertions, 0 deletions
diff --git a/eval.c b/eval.c
index 7308409df1..55e34c21ae 100644
--- a/eval.c
+++ b/eval.c
@@ -11103,7 +11103,11 @@ rb_thread_schedule()
                     if ((FD_ISSET(fd, &readfds) ||
                          FD_ISSET(fd, &writefds) ||
                          FD_ISSET(fd, &exceptfds)) &&
+#ifndef _WIN32
                         fcntl(fd, F_GETFD, &dummy) == -1 &&
+#else
+			rb_w32_get_osfhandle(fd) == -1 &&
+#endif
                         errno == EBADF) {
                         badfd = fd;
                         break;