diff --git a/config/config.go b/config/config.go
index 5dac1f9..690170f 100644
--- a/config/config.go
+++ b/config/config.go
@@ -136,11 +136,11 @@ type UserDef struct {
 
 type FileDef struct {
 	Path      string
-	Mode      os.FileMode
-	Content   string
-	Content64 string
-	Symlink   string
-	Dir       bool
+	Mode      os.FileMode `json:",omitempty" yaml:",omitempty"`
+	Content   string      `json:",omitempty" yaml:",omitempty"`
+	Content64 string      `json:",omitempty" yaml:",omitempty"`
+	Symlink   string      `json:",omitempty" yaml:",omitempty"`
+	Dir       bool        `json:",omitempty" yaml:",omitempty"`
 }
 
 type NetworkDef struct {