diff --git a/libntfs/volume.c b/libntfs/volume.c
index d1049e1f..eb426a86 100644
--- a/libntfs/volume.c
+++ b/libntfs/volume.c
@@ -792,7 +792,7 @@ ntfs_volume *ntfs_device_mount(struct ntfs_device *dev, unsigned long rwflag)
 	vinf = (VOLUME_INFORMATION*)(le16_to_cpu(a->value_offset) + (char*)a);
 	/* Sanity checks. */
 	if ((char*)vinf + le32_to_cpu(a->value_length) > (char*)ctx->mrec +
-			le16_to_cpu(ctx->mrec->bytes_in_use) ||
+			le32_to_cpu(ctx->mrec->bytes_in_use) ||
 			le16_to_cpu(a->value_offset) + le32_to_cpu(
 			a->value_length) > le32_to_cpu(a->length)) {
 		Dputs(FAILED);