diff --git a/include/net/ip.h b/include/net/ip.h
index be3cad9..aa09ae5 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -38,6 +38,10 @@
 #define IPV4_MAX_PMTU		65535U		/* RFC 2675, Section 5.1 */
 #define IPV4_MIN_MTU		68			/* RFC 791 */
 
+extern unsigned int sysctl_fib_sync_mem;
+extern unsigned int sysctl_fib_sync_mem_min;
+extern unsigned int sysctl_fib_sync_mem_max;
+
 struct sock;
 
 struct inet_skb_parm {