diff --git a/screen1d/screen1d.go b/screen1d/screen1d.go
index ab50b8e..0847bd9 100644
--- a/screen1d/screen1d.go
+++ b/screen1d/screen1d.go
@@ -26,6 +26,8 @@ import (
 type Opts struct {
 	X       int
 	Palette *ansi256.Palette
+
+	_ struct{}
 }
 
 // Dev is a 1D LED strip emulator that outputs to the console.