diff --git a/include/linux/file.h b/include/linux/file.h
index be37423..6e77b91 100644
--- a/include/linux/file.h
+++ b/include/linux/file.h
@@ -64,6 +64,8 @@
 
 #define files_fdtable(files) (rcu_dereference((files)->fdt))
 
+extern struct kmem_cache *filp_cachep;
+
 extern void FASTCALL(__fput(struct file *));
 extern void FASTCALL(fput(struct file *));