diff --git a/isisd/isis_spf.c b/isisd/isis_spf.c
index 1cb5113..e0a8d01 100644
--- a/isisd/isis_spf.c
+++ b/isisd/isis_spf.c
@@ -1492,7 +1492,7 @@
   struct listnode *anode;
   struct isis_vertex *vertex;
   struct isis_adjacency *adj;
-  u_char buff[255];
+  u_char buff[BUFSIZ];
 
   vty_out (vty, "Vertex               Type         Metric "
                 "Next-Hop             Interface Parent%s", VTY_NEWLINE);