diff --git a/du5/a_station.c b/du5/a_station.c
index ef0ae43..24f1b68 100644
--- a/du5/a_station.c
+++ b/du5/a_station.c
@@ -1,4 +1,7 @@
 #include "a_station.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stddef.h>
 
 struct station* create_station() {
     struct station* s = calloc(1, sizeof(struct station));