1 files changed, 1 insertions, 1 deletions
diff --git a/ipproto.c b/ipproto.c
index 7b89afb9..644b3642 100755
--- a/ipproto.c
+++ b/ipproto.c
@@ -27,7 +27,7 @@ static const char rcsid[] _U_ =
 #include "interface.h"
 #include "ipproto.h"
 
-struct tok ipproto_values[] = {
+const struct tok ipproto_values[] = {
     { IPPROTO_HOPOPTS, "Options" },
     { IPPROTO_ICMP, "ICMP" },
     { IPPROTO_IGMP, "IGMP" },