diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 8e77016..ab62907 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -68,7 +68,7 @@
 		   "(NILFS)");
 MODULE_LICENSE("GPL");
 
-struct kmem_cache *nilfs_inode_cachep;
+static struct kmem_cache *nilfs_inode_cachep;
 struct kmem_cache *nilfs_transaction_cachep;
 struct kmem_cache *nilfs_segbuf_cachep;
 struct kmem_cache *nilfs_btree_path_cache;