diff --git a/packages/rrweb/src/record/mutation.ts b/packages/rrweb/src/record/mutation.ts
index 9fde0c5fd9..377ca7be8a 100644
--- a/packages/rrweb/src/record/mutation.ts
+++ b/packages/rrweb/src/record/mutation.ts
@@ -132,10 +132,10 @@ class DoubleLinkedList {
   public defragment() {
     let current = this.head;
     while (current) {
-        let next = current.next;
-        this.removeNode(current.value);
-        this.addNode(current.value);
-        current = next;
+      let next = current.next;
+      this.removeNode(current.value);
+      this.addNode(current.value);
+      current = next;
     }
   }
 }
@@ -378,7 +378,7 @@ export default class MutationBuffer {
     }
 
     let candidate: DoubleLinkedListNode | null = null;
-    addList.defragment()
+    addList.defragment();
     while (addList.length) {
       let node: DoubleLinkedListNode | null = null;
       if (candidate) {