diff --git a/src/record/shadow-dom-manager.ts b/src/record/shadow-dom-manager.ts
index 71d233d2..92774f4e 100644
--- a/src/record/shadow-dom-manager.ts
+++ b/src/record/shadow-dom-manager.ts
@@ -34,7 +34,7 @@ export class ShadowDomManager {
   }) {
     this.mutationCb = options.mutationCb;
     this.bypassOptions = options.bypassOptions;
-    this.mirror = this.mirror;
+    this.mirror = options.mirror;
   }
 
   public addShadowRoot(shadowRoot: ShadowRoot, doc: Document) {