diff --git a/packages/svelte/src/internal/client/dom/blocks/boundary.js b/packages/svelte/src/internal/client/dom/blocks/boundary.js
index a734e09a79..1738a27ff2 100644
--- a/packages/svelte/src/internal/client/dom/blocks/boundary.js
+++ b/packages/svelte/src/internal/client/dom/blocks/boundary.js
@@ -47,6 +47,7 @@ export function boundary(node, props, children) {
 
 export class Boundary {
 	inert = false;
+	ran = false;
 
 	/** @type {Boundary | null} */
 	parent;