diff --git a/label.go b/label.go
index 44cfff4..175f8f0 100644
--- a/label.go
+++ b/label.go
@@ -4,6 +4,8 @@ import "git.tebibyte.media/tomo/tomo"
 import "git.tebibyte.media/tomo/tomo/text"
 import "git.tebibyte.media/tomo/tomo/event"
 
+var _ tomo.Object = new(Label)
+
 // Label is a simple text label.
 type Label struct {
 	box tomo.TextBox