diff --git a/zebra/kernel_socket.c b/zebra/kernel_socket.c
index e77b9b7..8beac71 100644
--- a/zebra/kernel_socket.c
+++ b/zebra/kernel_socket.c
@@ -161,7 +161,7 @@
   {0,            NULL}
 };
 
-struct message rtm_flag_str[] =
+static const struct message rtm_flag_str[] =
 {
   {RTF_UP,        "UP"},
   {RTF_GATEWAY,   "GATEWAY"},