diff --git a/docs/chapter_array_and_linkedlist/linked_list.md b/docs/chapter_array_and_linkedlist/linked_list.md
index 6b4277d48..e485bb52d 100755
--- a/docs/chapter_array_and_linkedlist/linked_list.md
+++ b/docs/chapter_array_and_linkedlist/linked_list.md
@@ -152,7 +152,7 @@
 
     /* 构造函数 */
     ListNode *newListNode(int val) {
-        ListNode *node, *next;
+        ListNode *node;
         node = (ListNode *) malloc(sizeof(ListNode));
         node->val = val;
         node->next = NULL;
@@ -618,7 +618,7 @@
 
     /* 构造函数 */
     ListNode *newListNode(int val) {
-        ListNode *node, *next;
+        ListNode *node;
         node = (ListNode *) malloc(sizeof(ListNode));
         node->val = val;
         node->next = NULL;