diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
index cf191ef26410..b86e93795846 100644
--- a/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
@@ -40,9 +40,9 @@
 
 #define LNET_MINOR 240
 
-static inline int libcfs_ioctl_packlen(struct libcfs_ioctl_data *data)
+static inline size_t libcfs_ioctl_packlen(struct libcfs_ioctl_data *data)
 {
-	int len = sizeof(*data);
+	size_t len = sizeof(*data);
 
 	len += cfs_size_round(data->ioc_inllen1);
 	len += cfs_size_round(data->ioc_inllen2);