diff --git a/dialog/internal/dialog.ts b/dialog/internal/dialog.ts
index f3acac47b1..0f5285b48d 100644
--- a/dialog/internal/dialog.ts
+++ b/dialog/internal/dialog.ts
@@ -564,7 +564,7 @@ export class Dialog extends dialogBaseClass {
   private getFirstAndLastFocusableChildren(): [HTMLElement, HTMLElement]
   | [null, null] {
     if (!this.treewalker) {
-      return [null, null] as const;
+      return [null, null];
     }
 
     let firstFocusableChild: HTMLElement | null = null;