diff --git a/internal/ui/window.go b/internal/ui/window.go
index c6e3ea2..397f09b 100644
--- a/internal/ui/window.go
+++ b/internal/ui/window.go
@@ -26,6 +26,8 @@ type Window struct {
 //
 // ebiten assumes a single window, so only call this once...
 func NewWindow(title string) (*Window, error) {
+	ebiten.SetRunnableInBackground(true)
+
 	return &Window{
 		Title:         title,
 		KeyUpHandlers: make(map[ebiten.Key]func()),