diff --git a/drivers/s390/crypto/ap_card.c b/drivers/s390/crypto/ap_card.c
index 0110d44172a3..1cd9128593e4 100644
--- a/drivers/s390/crypto/ap_card.c
+++ b/drivers/s390/crypto/ap_card.c
@@ -137,7 +137,7 @@ static const struct attribute_group *ap_card_dev_attr_groups[] = {
 	NULL
 };
 
-struct device_type ap_card_type = {
+static struct device_type ap_card_type = {
 	.name = "ap_card",
 	.groups = ap_card_dev_attr_groups,
 };
diff --git a/drivers/s390/crypto/ap_queue.c b/drivers/s390/crypto/ap_queue.c
index b58a917dc510..7be67fa9f224 100644
--- a/drivers/s390/crypto/ap_queue.c
+++ b/drivers/s390/crypto/ap_queue.c
@@ -564,7 +564,7 @@ static const struct attribute_group *ap_queue_dev_attr_groups[] = {
 	NULL
 };
 
-struct device_type ap_queue_type = {
+static struct device_type ap_queue_type = {
 	.name = "ap_queue",
 	.groups = ap_queue_dev_attr_groups,
 };