1 files changed, 5 insertions, 0 deletions
diff --git a/ext/socket/init.c b/ext/socket/init.c
index 85cc3de4f9..b143dccd5f 100644
--- a/ext/socket/init.c
+++ b/ext/socket/init.c
@@ -45,10 +45,15 @@ rsock_init_sock(VALUE sock, int fd)
     rb_io_t *fp;
     struct stat sbuf;
 
+#ifndef _WIN32
     if (fstat(fd, &sbuf) < 0)
         rb_sys_fail(0);
     if (!S_ISSOCK(sbuf.st_mode))
         rb_raise(rb_eArgError, "not a socket file descriptor");
+#else
+    if (!rb_w32_is_socket(fd))
+        rb_raise(rb_eArgError, "not a socket file descriptor");
+#endif
 
     MakeOpenFile(sock, fp);
     fp->fd = fd;