diff --git a/ports/unix/include/netif/sio.h b/ports/unix/include/netif/sio.h
index e47a27e..bbe6f3e 100644
--- a/ports/unix/include/netif/sio.h
+++ b/ports/unix/include/netif/sio.h
@@ -1,5 +1,5 @@
-#ifndef SIO_H
-#define SIO_H
+#ifndef SIO_UNIX_H
+#define SIO_UNIX_H
 
 #include "lwip/sys.h"
 #include "lwip/netif.h"