diff --git a/sys/netipsec/xform_ipcomp.c b/sys/netipsec/xform_ipcomp.c
index 778cd955310..61fb9413a01 100644
--- a/sys/netipsec/xform_ipcomp.c
+++ b/sys/netipsec/xform_ipcomp.c
@@ -762,7 +762,7 @@ static struct xformsw ipcomp_xformsw = {
 };
 
 static void
-ipcomp_attach(void)
+ipcomp_attach(void *dummy __unused)
 {
 
 #ifdef INET
@@ -775,7 +775,7 @@ ipcomp_attach(void)
 }
 
 static void
-ipcomp_detach(void)
+ipcomp_detach(void *dummy __unused)
 {
 
 #ifdef INET