diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
index d439314..85d9089 100644
--- a/drivers/acpi/event.c
+++ b/drivers/acpi/event.c
@@ -110,6 +110,7 @@
 	.read = acpi_system_read_event,
 	.release = acpi_system_close_event,
 	.poll = acpi_system_poll_event,
+	.llseek = default_llseek,
 };
 #endif	/* CONFIG_ACPI_PROC_EVENT */