diff --git a/c-cpp/06_linkedlist/single_list.c b/c-cpp/06_linkedlist/single_list.c
index 6c12868..0c2d761 100644
--- a/c-cpp/06_linkedlist/single_list.c
+++ b/c-cpp/06_linkedlist/single_list.c
@@ -74,7 +74,7 @@ struct single_list** search(struct single_list_head* head, int target)
 
 void reverse(struct single_list_head* head)
 {
-	struct single_list_head tmp;
+	struct single_list_head tmp = {NULL};
 	struct single_list *elem;
 
 	while (!is_empty(head)) {