diff --git a/packages/svelte/src/internal/client/reactivity/batch.js b/packages/svelte/src/internal/client/reactivity/batch.js
index 4a4864581d..1575d6561d 100644
--- a/packages/svelte/src/internal/client/reactivity/batch.js
+++ b/packages/svelte/src/internal/client/reactivity/batch.js
@@ -76,7 +76,12 @@ export let is_flushing_sync = false;
  */
 export let collected_effects = null;
 
+let uid = 1;
+
 export class Batch {
+	// for debugging. TODO remove once async is stable
+	id = uid++;
+
 	/**
 	 * The current values of any sources that are updated in this batch
 	 * They keys of this map are identical to `this.#previous`