diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index cb1f0e8..3959e0c 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -132,7 +132,7 @@
 }
 #endif
 
-static struct net_protocol tunnel4_protocol = {
+static const struct net_protocol tunnel4_protocol = {
 	.handler	=	tunnel4_rcv,
 	.err_handler	=	tunnel4_err,
 	.no_policy	=	1,
@@ -140,7 +140,7 @@
 };
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-static struct net_protocol tunnel64_protocol = {
+static const struct net_protocol tunnel64_protocol = {
 	.handler	=	tunnel64_rcv,
 	.err_handler	=	tunnel64_err,
 	.no_policy	=	1,