diff --git a/sointu.go b/sointu.go
index 5cb74f2..7635100 100644
--- a/sointu.go
+++ b/sointu.go
@@ -10,7 +10,7 @@ import (
 type Unit struct {
 	Type       string
 	Parameters map[string]int `yaml:",flow"`
-	VarArgs    []int          `,omitempty`
+	VarArgs    []int          `yaml:",flow,omitempty"`
 }
 
 const (