diff --git a/newlib/libc/sys/rtems/include/netinet/tcp.h b/newlib/libc/sys/rtems/include/netinet/tcp.h
index e7c47e85b..6dc7403aa 100644
--- a/newlib/libc/sys/rtems/include/netinet/tcp.h
+++ b/newlib/libc/sys/rtems/include/netinet/tcp.h
@@ -210,6 +210,7 @@ struct tcphdr {
 #define	TCP_PCAP_OUT	2048	/* number of output packets to keep */
 #define	TCP_PCAP_IN	4096	/* number of input packets to keep */
 #define TCP_FUNCTION_BLK 8192	/* Set the tcp function pointers to the specified stack */
+#define TCP_FUNCTION_ALIAS 8193	/* Get the current tcp function pointer name alias */
 /* Options for Rack and BBR */
 #define	TCP_REUSPORT_LB_NUMA   1026	/* set listen socket numa domain */
 #define TCP_RACK_MBUF_QUEUE   1050 /* Do we allow mbuf queuing if supported */