diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index ef42316..e0f1534 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -751,6 +751,7 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
 		return status;
 	ec->gpe = tmp;
 	/* Use the global lock for all EC transactions? */
+	tmp = 0;
 	acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
 	ec->global_lock = tmp;
 	ec->handle = handle;