diff --git a/newlib/libc/sys/rtems/include/net/if.h b/newlib/libc/sys/rtems/include/net/if.h
index a9b875cf1..a60374d54 100644
--- a/newlib/libc/sys/rtems/include/net/if.h
+++ b/newlib/libc/sys/rtems/include/net/if.h
@@ -246,6 +246,7 @@ struct if_data {
 #define	IFCAP_HWSTATS		0x800000 /* manages counters internally */
 #define	IFCAP_TXRTLMT		0x1000000 /* hardware supports TX rate limiting */
 #define	IFCAP_HWRXTSTMP		0x2000000 /* hardware rx timestamping */
+#define	IFCAP_NOMAP		0x4000000 /* can TX unmapped mbufs */
 
 #define IFCAP_HWCSUM_IPV6	(IFCAP_RXCSUM_IPV6 | IFCAP_TXCSUM_IPV6)