diff --git a/arch/mips/include/asm/socket.h b/arch/mips/include/asm/socket.h
index 289ce5f..ae05acc 100644
--- a/arch/mips/include/asm/socket.h
+++ b/arch/mips/include/asm/socket.h
@@ -43,6 +43,7 @@
 #define SO_RCVTIMEO 	0x1006	/* receive timeout */
 #define SO_ACCEPTCONN	0x1009
 #define SO_PROTOCOL	0x1028	/* protocol type */
+#define SO_DOMAIN	0x1029	/* domain/socket family */
 
 /* linux-specific, might as well be the same as on i386 */
 #define SO_NO_CHECK	11