diff --git a/newlib/libc/sys/rtems/include/net/if.h b/newlib/libc/sys/rtems/include/net/if.h
index e9e639139..d88003bdd 100644
--- a/newlib/libc/sys/rtems/include/net/if.h
+++ b/newlib/libc/sys/rtems/include/net/if.h
@@ -412,7 +412,9 @@ struct	ifreq {
 #define	ifr_mtu		ifr_ifru.ifru_mtu	/* mtu */
 #define ifr_phys	ifr_ifru.ifru_phys	/* physical wire */
 #define ifr_media	ifr_ifru.ifru_media	/* physical media */
+#ifndef _KERNEL
 #define	ifr_data	ifr_ifru.ifru_data	/* for use by interface */
+#endif
 #define	ifr_reqcap	ifr_ifru.ifru_cap[0]	/* requested capabilities */
 #define	ifr_curcap	ifr_ifru.ifru_cap[1]	/* current capabilities */
 #define	ifr_index	ifr_ifru.ifru_index	/* interface index */