diff --git a/hw/s390x/s390-skeys.c b/hw/s390x/s390-skeys.c
index f2b732e300..0cd340747d 100644
--- a/hw/s390x/s390-skeys.c
+++ b/hw/s390x/s390-skeys.c
@@ -237,7 +237,7 @@ static const TypeInfo qemu_s390_skeys_info = {
     .instance_init = qemu_s390_skeys_init,
     .instance_size = sizeof(QEMUS390SKeysState),
     .class_init    = qemu_s390_skeys_class_init,
-    .instance_size = sizeof(S390SKeysClass),
+    .class_size    = sizeof(S390SKeysClass),
 };
 
 static void s390_storage_keys_save(QEMUFile *f, void *opaque)