diff --git a/cv4/list_ops.c b/cv4/list_ops.c
index b535771..8d7a0f8 100644
--- a/cv4/list_ops.c
+++ b/cv4/list_ops.c
@@ -1,4 +1,5 @@
 #include "list_ops.h"
+#include <string.h>
 
 list_t *new_list(size_t length, list_element_t elements[]){
   list_t* list = (list_t*)malloc(sizeof(list_t) + length * sizeof(list_element_t));