diff --git a/packages/svelte/tests/runtime-runes/samples/class-state-constructor-closure-private-3/_config.js b/packages/svelte/tests/runtime-runes/samples/class-state-constructor-closure-private-3/_config.js
new file mode 100644
index 0000000000..dd847ce2f2
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/class-state-constructor-closure-private-3/_config.js
@@ -0,0 +1,13 @@
+import { flushSync } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	html: `<button>10</button>`,
+	ssrHtml: `<button>0</button>`,
+
+	async test({ assert, target }) {
+		flushSync();
+
+		assert.htmlEqual(target.innerHTML, `<button>10</button>`);
+	}
+});
diff --git a/packages/svelte/tests/runtime-runes/samples/class-state-constructor-closure-private-3/main.svelte b/packages/svelte/tests/runtime-runes/samples/class-state-constructor-closure-private-3/main.svelte
new file mode 100644
index 0000000000..47b8c901eb
--- /dev/null
+++ b/packages/svelte/tests/runtime-runes/samples/class-state-constructor-closure-private-3/main.svelte
@@ -0,0 +1,12 @@
+<script>
+	const counter = new class Counter {
+		constructor() {
+			this.count = $state(0);
+			$effect(() => {
+				this.count = 10;
+			});
+		}
+	}
+</script>
+
+<button on:click={() => counter.count++}>{counter.count}</button>