diff --git a/efi/efivars/bootvariables.go b/efi/efivars/bootvariables.go
index f30e8ff..5b03217 100644
--- a/efi/efivars/bootvariables.go
+++ b/efi/efivars/bootvariables.go
@@ -74,6 +74,7 @@ var (
 		guid:         GlobalVariable,
 		defaultAttrs: defaultAttrs,
 		unmarshal:    sliceUnmarshaller[uint16],
+		marshal:      sliceMarshaller[uint16],
 	}
 )