diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 26a06b8..2bcef65 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -21,8 +21,7 @@
 #include "power/power.h"
 
 /* /sys/devices/system */
-/* FIXME: make static after drivers/base/sys.c is deleted */
-struct kset *system_kset;
+static struct kset *system_kset;
 
 #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)