diff --git a/packages/rrweb/src/record/mutation.ts b/packages/rrweb/src/record/mutation.ts
index 46181130..202efb24 100644
--- a/packages/rrweb/src/record/mutation.ts
+++ b/packages/rrweb/src/record/mutation.ts
@@ -320,7 +320,7 @@ export default class MutationBuffer {
             );
           }
           if (hasShadowRoot(n)) {
-            this.shadowDomManager.addShadowRoot(n.shadowRoot, document);
+            this.shadowDomManager.addShadowRoot(n.shadowRoot, this.doc);
           }
         },
         onIframeLoad: (iframe, childSn) => {