diff --git a/label_types.go b/label_types.go
index 834aa8b..ec64eab 100644
--- a/label_types.go
+++ b/label_types.go
@@ -21,7 +21,9 @@ const (
 )
 
 type Label struct {
-	ID    string
+	ID       string
+	ParentID string
+
 	Name  string
 	Path  []string
 	Color string
diff --git a/server/backend/label.go b/server/backend/label.go
index bdb42bf..6055ab5 100644
--- a/server/backend/label.go
+++ b/server/backend/label.go
@@ -31,9 +31,10 @@ func (label *label) toLabel(labels map[string]*label) proton.Label {
 	}
 
 	return proton.Label{
-		ID:   label.labelID,
-		Name: label.name,
-		Path: path,
-		Type: label.labelType,
+		ID:       label.labelID,
+		ParentID: label.parentID,
+		Name:     label.name,
+		Path:     path,
+		Type:     label.labelType,
 	}
 }