diff --git a/ospf6d/ospf6_zebra.c b/ospf6d/ospf6_zebra.c
index b5ffc0a..7083c96 100644
--- a/ospf6d/ospf6_zebra.c
+++ b/ospf6d/ospf6_zebra.c
@@ -335,7 +335,7 @@
 }
 
 /* Zebra node structure. */
-struct cmd_node zebra_node =
+static struct cmd_node zebra_node =
 {
   ZEBRA_NODE,
   "%s(config-zebra)# ",