diff --git a/cv4/list_ops.c b/cv4/list_ops.c
index 772c97b..36caeba 100644
--- a/cv4/list_ops.c
+++ b/cv4/list_ops.c
@@ -1,6 +1,8 @@
 #include "list_ops.h"
 #include <stdlib.h>
 #include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
 
 list_t *new_list(size_t length, list_element_t elements[]) {
     list_t *list = malloc(sizeof(list_t) + length * sizeof(list_element_t));