diff --git a/sys/kern/subr_autoconf.c b/sys/kern/subr_autoconf.c
index 5c278afb61c2..0166258a534c 100644
--- a/sys/kern/subr_autoconf.c
+++ b/sys/kern/subr_autoconf.c
@@ -116,7 +116,7 @@ run_interrupt_driven_config_hooks_warning(int warned)
 }
 
 static void
-run_interrupt_driven_config_hooks()
+run_interrupt_driven_config_hooks(void)
 {
 	static int running;
 	struct intr_config_hook *hook_entry;