diff --git a/sys/net/dummymbuf.c b/sys/net/dummymbuf.c
--- a/sys/net/dummymbuf.c
+++ b/sys/net/dummymbuf.c
@@ -437,7 +437,7 @@
 }
 
 static void
-vnet_dmb_init(void *unused __unused)
+vnet_dmb_init(const void *unused __unused)
 {
 	sx_init(&V_dmb_rules_lock, "dummymbuf rules");
 	V_dmb_hits = counter_u64_alloc(M_WAITOK);
@@ -447,7 +447,7 @@
     vnet_dmb_init, NULL);
 
 static void
-vnet_dmb_uninit(void *unused __unused)
+vnet_dmb_uninit(const void *unused __unused)
 {
 	dmb_pfil_uninit();
 	counter_u64_free(V_dmb_hits);
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -759,7 +759,7 @@
 SYSINIT(ether, SI_SUB_INIT_IF, SI_ORDER_ANY, ether_init, NULL);
 
 static void
-vnet_ether_init(__unused void *arg)
+vnet_ether_init(const __unused void *arg)
 {
 	struct pfil_head_args args;
 
@@ -778,7 +778,7 @@
 
 #ifdef VIMAGE
 static void
-vnet_ether_pfil_destroy(__unused void *arg)
+vnet_ether_pfil_destroy(const __unused void *arg)
 {
 
 	pfil_head_unregister(V_link_pfil_head);