diff --git a/cv4/list_ops.c b/cv4/list_ops.c
index da7fad1..89d2ada 100644
--- a/cv4/list_ops.c
+++ b/cv4/list_ops.c
@@ -42,11 +42,12 @@ size_t length_list(list_t *list) {
 }
 
 list_t *map_list(list_t *list, list_element_t (*mapper)(list_element_t)) {
-    for (size_t i = 0; i < list->length; i++) {
-        list->elements[i] = mapper(list->elements[i]);
+    list_t *result = malloc(list->length);
+	for (size_t i = 0; i < list->length; i++) {
+        result->elements[i] = mapper(list->elements[i]);
     }
 
-    return list;
+    return result;
 }