diff --git a/packages/svelte/src/internal/client/runtime.js b/packages/svelte/src/internal/client/runtime.js
index 73be0ef832..192f657a7e 100644
--- a/packages/svelte/src/internal/client/runtime.js
+++ b/packages/svelte/src/internal/client/runtime.js
@@ -828,6 +828,8 @@ export function flushSync(fn) {
 		result = fn();
 	}
 
+	flush_tasks();
+
 	while (queued_root_effects.length > 0) {
 		is_flushing = true;
 		flush_queued_root_effects();