diff --git a/kernel/kmod.c b/kernel/kmod.c
index 51a8920..20a997c 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -170,7 +170,7 @@
 	sa.sa.sa_handler = SIG_IGN;
 	sa.sa.sa_flags = 0;
 	siginitset(&sa.sa.sa_mask, sigmask(SIGCHLD));
-	do_sigaction(SIGCHLD, &sa, (struct k_sigaction *)0);
+	do_sigaction(SIGCHLD, &sa, NULL);
 	allow_signal(SIGCHLD);
 
 	pid = kernel_thread(____call_usermodehelper, sub_info, SIGCHLD);