diff --git a/zebra/zebra_rib.c b/zebra/zebra_rib.c
index 09f3597..c88264b 100644
--- a/zebra/zebra_rib.c
+++ b/zebra/zebra_rib.c
@@ -51,7 +51,7 @@
 int rib_process_hold_time = 10;
 
 /* Each route type's string and default distance value. */
-struct
+static const struct
 {  
   int key;
   int distance;
@@ -70,7 +70,7 @@
 };
 
 /* Vector for routing table.  */
-vector vrf_vector;
+static vector vrf_vector;
 
 /* Allocate new VRF.  */
 static struct vrf *