diff --git a/cv4/list_ops.c b/cv4/list_ops.c
index c5feec9..11168cd 100644
--- a/cv4/list_ops.c
+++ b/cv4/list_ops.c
@@ -49,10 +49,11 @@ size_t length_list(list_t *list) {
 
 list_t *map_list(list_t *list, list_element_t (*mapper)(list_element_t)) {
     list_t *result = new_list(list->length, list->elements);
-     if (result == NULL) {
+    if (result == NULL) {
         return NULL; 
     }
-	for (size_t i = 0; i < list->length; i++) {
+
+    for (size_t i = 0; i < list->length; i++) {
         result->elements[i] = mapper(list->elements[i]);
     }