diff --git a/usr.sbin/acpi/acpiconf/acpiconf.c b/usr.sbin/acpi/acpiconf/acpiconf.c
index 63e55a6b7be0..df110443d553 100644
--- a/usr.sbin/acpi/acpiconf/acpiconf.c
+++ b/usr.sbin/acpi/acpiconf/acpiconf.c
@@ -45,7 +45,7 @@
 
 static int	acpifd;
 
-static int
+static void
 acpi_init(void)
 {
 	acpifd = open(ACPIDEV, O_RDWR);