diff --git a/host/generic/spibus.go b/host/generic/spibus.go
index f682daa..2f8c26d 100644
--- a/host/generic/spibus.go
+++ b/host/generic/spibus.go
@@ -36,6 +36,9 @@ type spiIOCTransfer struct {
 	speedHz     uint32
 	delayus     uint16
 	bitsPerWord uint8
+
+	csChange uint8
+	pad      uint32
 }
 
 type spiBus struct {