diff --git a/drivers/base/base.h b/drivers/base/base.h
index 79115ef..c3b8dc9 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -42,4 +42,5 @@
 	return container_of(_attr, struct class_device_attribute, attr);
 }
 
+extern char *make_class_name(const char *name, struct kobject *kobj);