diff --git a/tools/include/uapi/linux/if_addr.h b/tools/include/uapi/linux/if_addr.h
index aa7958b4e41d..7fb630b7fe31 100644
--- a/tools/include/uapi/linux/if_addr.h
+++ b/tools/include/uapi/linux/if_addr.h
@@ -36,6 +36,7 @@ enum {
 	IFA_RT_PRIORITY,	/* u32, priority/metric for prefix route */
 	IFA_TARGET_NETNSID,
 	IFA_PROTO,		/* u8, address protocol */
+	IFA_MC_USERS,		/* u32, multicast group users */
 	__IFA_MAX,
 };