diff --git a/separator.go b/separator.go
index f6f03c4..d1e1f61 100644
--- a/separator.go
+++ b/separator.go
@@ -2,6 +2,8 @@ package objects
 
 import "git.tebibyte.media/tomo/tomo"
 
+var _ tomo.Object = new(Separator)
+
 // Separator is a line for visually separating elements.
 type Separator struct {
 	box tomo.Box