1 files changed, 1 insertions, 0 deletions
diff --git a/signs.c b/signs.c
index c640ad2cb..2d86dd00e 100644
--- a/signs.c
+++ b/signs.c
@@ -1,6 +1,7 @@
 #include "stdafx.h"
 #include "openttd.h"
 #include "table/strings.h"
+#include "functions.h"
 #include "player.h"
 #include "signs.h"
 #include "saveload.h"