diff --git a/drivers/base/core.c b/drivers/base/core.c
index dbc2ba6dfffc..cf6f41c2060c 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2256,7 +2256,9 @@ int (*platform_notify)(struct device *dev) = NULL;
 int (*platform_notify_remove)(struct device *dev) = NULL;
 static struct kobject *dev_kobj;
 struct kobject *sysfs_dev_char_kobj;
-struct kobject *sysfs_dev_block_kobj;
+
+/* /sys/dev/block */
+static struct kobject *sysfs_dev_block_kobj;
 
 static DEFINE_MUTEX(device_hotplug_lock);
 
diff --git a/include/linux/device/class.h b/include/linux/device/class.h
index e946642c314e..7e4a1a6329f4 100644
--- a/include/linux/device/class.h
+++ b/include/linux/device/class.h
@@ -76,8 +76,6 @@ struct class_dev_iter {
 	const struct device_type	*type;
 };
 
-extern struct kobject *sysfs_dev_block_kobj;
-
 int __must_check class_register(struct class *class);
 void class_unregister(const struct class *class);
 bool class_is_registered(const struct class *class);