diff --git a/include/linux/mroute.h b/include/linux/mroute.h
index ea00d9162ee57c858954e8ec8cd36d4ebf0f15e0..79aaa9fc1a15d6ed7caac2b147ae030b18da060a 100644
--- a/include/linux/mroute.h
+++ b/include/linux/mroute.h
@@ -9,7 +9,7 @@
 #ifdef CONFIG_IP_MROUTE
 static inline int ip_mroute_opt(int opt)
 {
-	return (opt >= MRT_BASE) && (opt <= MRT_BASE + 10);
+	return (opt >= MRT_BASE) && (opt <= MRT_MAX);
 }
 #else
 static inline int ip_mroute_opt(int opt)
diff --git a/include/linux/mroute6.h b/include/linux/mroute6.h
index a223561ba12e397e89d23dcd2ed3fd3e4311645a..66982e7640514389098c140a39665f95261071d8 100644
--- a/include/linux/mroute6.h
+++ b/include/linux/mroute6.h
@@ -10,7 +10,7 @@
 #ifdef CONFIG_IPV6_MROUTE
 static inline int ip6_mroute_opt(int opt)
 {
-	return (opt >= MRT6_BASE) && (opt <= MRT6_BASE + 10);
+	return (opt >= MRT6_BASE) && (opt <= MRT6_MAX);
 }
 #else
 static inline int ip6_mroute_opt(int opt)
diff --git a/include/uapi/linux/in6.h b/include/uapi/linux/in6.h
index 5673b97dcf5475f4a6a660828ec1a9f2dd6c712c..53b1d56a6e7f3544b1cd3ec3bcac87b62e630c40 100644
--- a/include/uapi/linux/in6.h
+++ b/include/uapi/linux/in6.h
@@ -259,17 +259,10 @@ struct in6_flowlabel_req {
 
 /*
  * Multicast Routing:
- * see include/linux/mroute6.h.
+ * see include/uapi/linux/mroute6.h.
  *
- * MRT6_INIT			200
- * MRT6_DONE			201
- * MRT6_ADD_MIF			202
- * MRT6_DEL_MIF			203
- * MRT6_ADD_MFC			204
- * MRT6_DEL_MFC			205
- * MRT6_VERSION			206
- * MRT6_ASSERT			207
- * MRT6_PIM			208
- * (reserved)			209
+ * MRT6_BASE			200
+ * ...
+ * MRT6_MAX
  */
 #endif /* _UAPI_LINUX_IN6_H */
diff --git a/include/uapi/linux/mroute.h b/include/uapi/linux/mroute.h
index 16929993acc4976535c73bf8172e29789275bfeb..1c11004af5dba0e8069ac7e0b760067880480182 100644
--- a/include/uapi/linux/mroute.h
+++ b/include/uapi/linux/mroute.h
@@ -26,6 +26,7 @@
 #define MRT_ASSERT	(MRT_BASE+7)	/* Activate PIM assert mode		*/
 #define MRT_PIM		(MRT_BASE+8)	/* enable PIM code			*/
 #define MRT_TABLE	(MRT_BASE+9)	/* Specify mroute table ID		*/
+#define MRT_MAX		(MRT_BASE+9)
 
 #define SIOCGETVIFCNT	SIOCPROTOPRIVATE	/* IP protocol privates */
 #define SIOCGETSGCNT	(SIOCPROTOPRIVATE+1)
diff --git a/include/uapi/linux/mroute6.h b/include/uapi/linux/mroute6.h
index 3e89b5e7f9e33052adeb6b5dafa01944f02ee5cc..c206ae3a23274d3a2dcb5778abdd9e4739283e91 100644
--- a/include/uapi/linux/mroute6.h
+++ b/include/uapi/linux/mroute6.h
@@ -26,6 +26,7 @@
 #define MRT6_ASSERT	(MRT6_BASE+7)	/* Activate PIM assert mode		*/
 #define MRT6_PIM	(MRT6_BASE+8)	/* enable PIM code			*/
 #define MRT6_TABLE	(MRT6_BASE+9)	/* Specify mroute table ID		*/
+#define MRT6_MAX	(MRT6_BASE+9)
 
 #define SIOCGETMIFCNT_IN6	SIOCPROTOPRIVATE	/* IP protocol privates */
 #define SIOCGETSGCNT_IN6	(SIOCPROTOPRIVATE+1)