diff --git a/train_cmd.c b/train_cmd.c
--- a/train_cmd.c
+++ b/train_cmd.c
@@ -30,6 +30,7 @@
 #include "newgrf_text.h"
 #include "direction.h"
 #include "yapf/yapf.h"
+#include "date.h"
 
 static bool TrainCheckIfLineEnds(Vehicle *v);
 static void TrainController(Vehicle *v);