diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 2375dc0a63..596b004001 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -833,6 +833,8 @@ export function flushSync(fn) {
 	while (queued_root_effects.length > 0) {
 		is_flushing = true;
 		flush_queued_root_effects();
+
+		is_flushing = true;
 		flush_tasks();
 	}