diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 8357306fb76e..fb9f31f36628 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -716,7 +716,7 @@ static void stp_work_fn(struct work_struct *work)
 /*
  * STP subsys sysfs interface functions
  */
-static struct bus_type stp_subsys = {
+static const struct bus_type stp_subsys = {
 	.name		= "stp",
 	.dev_name	= "stp",
 };