diff --git a/ospf6d/ospf6_interface.c b/ospf6d/ospf6_interface.c
index 4215208..5a79862 100644
--- a/ospf6d/ospf6_interface.c
+++ b/ospf6d/ospf6_interface.c
@@ -1509,7 +1509,7 @@
   return 0;
 }
 
-struct cmd_node interface_node =
+static struct cmd_node interface_node =
 {
   INTERFACE_NODE,
   "%s(config-if)# ",
diff --git a/ospf6d/ospf6_top.c b/ospf6d/ospf6_top.c
index d45d132..609df41 100644
--- a/ospf6d/ospf6_top.c
+++ b/ospf6d/ospf6_top.c
@@ -650,7 +650,7 @@
 }
 
 /* OSPF6 node structure. */
-struct cmd_node ospf6_node =
+static struct cmd_node ospf6_node =
 {
   OSPF6_NODE,
   "%s(config-ospf6)# ",
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)# ",
diff --git a/ospf6d/ospf6d.c b/ospf6d/ospf6d.c
index 1a615ff..7a766c8 100644
--- a/ospf6d/ospf6d.c
+++ b/ospf6d/ospf6d.c
@@ -92,7 +92,7 @@
   return CMD_SUCCESS;
 }
 
-struct cmd_node debug_node =
+static struct cmd_node debug_node =
 {
   DEBUG_NODE,
   "",