diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
index 4cd6a93e5581..4233dda3a939 100644
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -2733,6 +2733,10 @@ sogetopt(struct socket *so, struct sockopt *sopt)
 			optval = so->so_type;
 			goto integer;
 
+		case SO_PROTOCOL:
+			optval = so->so_proto->pr_protocol;
+			goto integer;
+
 		case SO_ERROR:
 			SOCK_LOCK(so);
 			optval = so->so_error;
diff --git a/sys/sys/socket.h b/sys/sys/socket.h
index 0d51a5bf56ef..d7c6c792d52f 100644
--- a/sys/sys/socket.h
+++ b/sys/sys/socket.h
@@ -138,6 +138,8 @@ typedef	__uid_t		uid_t;
 #define	SO_LISTENINCQLEN	0x1013	/* socket's incomplete queue length */
 #define	SO_SETFIB	0x1014		/* use this FIB to route */
 #define	SO_USER_COOKIE	0x1015		/* user cookie (dummynet etc.) */
+#define	SO_PROTOCOL	0x1016		/* get socket protocol (Linux name) */
+#define	SO_PROTOTYPE	SO_PROTOCOL	/* alias for SO_PROTOCOL (SunOS name) */
 #endif
 
 /*