1 files changed, 6 insertions, 1 deletions
diff --git a/ext/io/wait/extconf.rb b/ext/io/wait/extconf.rb
index ea7dc9f6cf..1352ef202e 100644
--- a/ext/io/wait/extconf.rb
+++ b/ext/io/wait/extconf.rb
@@ -3,10 +3,15 @@ target = "io/wait"
 
 unless macro_defined?("DOSISH", "#include <ruby.h>")
   fionread = %w[sys/ioctl.h sys/filio.h].find do |h|
-    checking_for("FIONREAD") {macro_defined?("FIONREAD", "#include <#{h}>\n")}
+    checking_for("FIONREAD") {have_macro("FIONREAD", h)}
   end
   if fionread
     $defs << "-DFIONREAD_HEADER=\"<#{fionread}>\""
     create_makefile(target)
   end
+else
+  if have_func("rb_w32_ioctlsocket", "ruby.h")
+    have_func("rb_w32_is_socket", "ruby.h")
+    create_makefile(target)
+  end
 end