diff --git a/isisd/isisd.h b/isisd/isisd.h
index 838a08b..6e95e8e 100644
--- a/isisd/isisd.h
+++ b/isisd/isisd.h
@@ -91,7 +91,8 @@
   struct isis_spftree *spftree6[ISIS_LEVELS];	  /* The v6 SPTs */
   struct route_table *route_table6[ISIS_LEVELS];  /* IPv6 routes */
 #endif
-  unsigned int min_bcast_mtu;
+#define DEFAULT_LSP_MTU 1497
+  unsigned int lsp_mtu;				  /* Size of LSPs to generate */
   struct list *circuit_list;	/* IS-IS circuits */
   struct flags flags;
   struct thread *t_tick;	/* LSP walker */