diff --git a/cv5/a_train.c b/cv5/a_train.c
index f862e4c..c790802 100644
--- a/cv5/a_train.c
+++ b/cv5/a_train.c
@@ -68,6 +68,8 @@ struct car* clear_train(struct car* first, const char* target) {
         struct car* only = prev->next;
         free(prev);
         prev = only;
+        free(only);
+        only = NULL;
         return first;
      
     }