diff --git a/drivers/staging/lustre/lustre/include/lustre_lib.h b/drivers/staging/lustre/lustre/include/lustre_lib.h
index 7daf9543f32c..3d75a8292d5f 100644
--- a/drivers/staging/lustre/lustre/include/lustre_lib.h
+++ b/drivers/staging/lustre/lustre/include/lustre_lib.h
@@ -153,9 +153,9 @@ struct obd_ioctl_data {
 
 	/* buffers the kernel will treat as user pointers */
 	__u32  ioc_plen1;
-	char  *ioc_pbuf1;
+	void __user *ioc_pbuf1;
 	__u32  ioc_plen2;
-	char  *ioc_pbuf2;
+	void __user *ioc_pbuf2;
 
 	/* inline buffers for various arguments */
 	__u32  ioc_inllen1;