diff --git a/src/vnet/fib/ip4_fib.h b/src/vnet/fib/ip4_fib.h
index 495b45c..438eb24 100644
--- a/src/vnet/fib/ip4_fib.h
+++ b/src/vnet/fib/ip4_fib.h
@@ -131,6 +131,7 @@
                                                  fib_source_t src);
 extern u32 ip4_fib_table_create_and_lock(fib_source_t src);
 
+extern u8 *format_ip4_fib_table_memory(u8 * s, va_list * args);
 
 static inline 
 u32 ip4_fib_index_from_table_id (u32 table_id)