diff --git a/extras/mini-os/include/errno.h b/extras/mini-os/include/errno.h
index aa45040a27..262ab3e0b4 100644
--- a/extras/mini-os/include/errno.h
+++ b/extras/mini-os/include/errno.h
@@ -66,6 +66,7 @@
 #define	EPROTONOSUPPORT	93	/* Protocol not supported */
 #define	ESOCKTNOSUPPORT	94	/* Socket type not supported */
 #define	EOPNOTSUPP	95	/* Operation not supported on transport endpoint */
+#define	ENOTSUP EOPNOTSUPP
 #define	EPFNOSUPPORT	96	/* Protocol family not supported */
 #define	EAFNOSUPPORT	97	/* Address family not supported by protocol */
 #define	EADDRINUSE	98	/* Address already in use */