diff --git a/include/linux/cdev.h b/include/linux/cdev.h
index f309b00..1e29b13 100644
--- a/include/linux/cdev.h
+++ b/include/linux/cdev.h
@@ -6,6 +6,10 @@
 #include <linux/kdev_t.h>
 #include <linux/list.h>
 
+struct file_operations;
+struct inode;
+struct module;
+
 struct cdev {
 	struct kobject kobj;
 	struct module *owner;