diff --git a/drivers/staging/lustre/lustre/ptlrpc/lproc_ptlrpc.c b/drivers/staging/lustre/lustre/ptlrpc/lproc_ptlrpc.c
index 927921541851..bc220308e7d7 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/lproc_ptlrpc.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/lproc_ptlrpc.c
@@ -628,7 +628,8 @@ static int ptlrpc_lprocfs_nrs_seq_show(struct seq_file *m, void *n)
  * if the optional token is omitted, the operation is performed on both the
  * regular and high-priority (if the service has one) NRS head.
  */
-static ssize_t ptlrpc_lprocfs_nrs_seq_write(struct file *file, const char *buffer,
+static ssize_t ptlrpc_lprocfs_nrs_seq_write(struct file *file,
+					const char __user *buffer,
 					size_t count, loff_t *off)
 {
 	struct ptlrpc_service *svc = ((struct seq_file *)file->private_data)->private;