diff --git a/ebitenutil/fs_test.go b/ebitenutil/fs_test.go
index 396f14387..d37cf97c1 100644
--- a/ebitenutil/fs_test.go
+++ b/ebitenutil/fs_test.go
@@ -16,6 +16,8 @@ package ebitenutil_test
 
 import (
 	"embed"
+	// `NewImageFromFileSystem` works without this importing, but this is not an expected thing (#2336).
+	_ "image/png"
 	"testing"
 
 	"github.com/hajimehoshi/ebiten/v2/ebitenutil"