diff --git a/src/table/airport_defaults.h b/src/table/airport_defaults.h
--- a/src/table/airport_defaults.h
+++ b/src/table/airport_defaults.h
@@ -10,6 +10,8 @@
 #ifndef AIRPORT_DEFAULTS_H
 #define AIRPORT_DEFAULTS_H
 
+#include "date_type.h"
+
 /**
  * Definition of an airport tiles layout.
  * @param x offset x of this tile