diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index e9ae0c6..0543439 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -455,7 +455,7 @@
 /*
  * Allocate nfs_write_data structures
  */
-extern struct nfs_write_data *nfs_writedata_alloc(size_t len);
+extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
 
 /*
  * linux/fs/nfs/read.c
@@ -469,7 +469,7 @@
 /*
  * Allocate nfs_read_data structures
  */
-extern struct nfs_read_data *nfs_readdata_alloc(size_t len);
+extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
 
 /*
  * linux/fs/nfs3proc.c