diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 688562a..1de36e6a 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -886,6 +886,7 @@ extern void afs_pages_written_back(struct afs_vnode *, struct afs_call *);
 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
 extern int afs_flush(struct file *, fl_owner_t);
 extern int afs_fsync(struct file *, loff_t, loff_t, int);
+extern int afs_page_mkwrite(struct vm_fault *);
 extern void afs_prune_wb_keys(struct afs_vnode *);
 extern int afs_launder_page(struct page *);