1 files changed, 1 insertions, 1 deletions
diff --git a/ipproto.h b/ipproto.h
index f5257863..96407541 100644
--- a/ipproto.h
+++ b/ipproto.h
@@ -37,7 +37,7 @@
  * $FreeBSD: src/sys/netinet/in.h,v 1.38.2.3 1999/08/29 16:29:34 peter Exp $
  */
 
-extern struct tok ipproto_values[];
+extern const struct tok ipproto_values[];
 
 #ifndef IPPROTO_IP
 #define	IPPROTO_IP		0		/* dummy for IP */