1 files changed, 1 insertions, 0 deletions
diff --git a/rail_gui.c b/rail_gui.c
index bdc474b48..11f94149d 100644
--- a/rail_gui.c
+++ b/rail_gui.c
@@ -2,6 +2,7 @@
 #include "openttd.h"
 #include "table/sprites.h"
 #include "table/strings.h"
+#include "functions.h"
 #include "map.h"
 #include "tile.h"
 #include "window.h"