diff --git a/internal/rendertest/util_test.go b/internal/rendertest/util_test.go
index 99643f92..ef76cc2b 100644
--- a/internal/rendertest/util_test.go
+++ b/internal/rendertest/util_test.go
@@ -197,5 +197,6 @@ func newWindow(t testing.TB, width, height int) *headless.Window {
 	if err != nil {
 		t.Skipf("failed to create headless window, skipping: %v", err)
 	}
+	t.Cleanup(w.Release)
 	return w
 }