1 files changed, 1 insertions, 0 deletions
diff --git a/openttd.c b/openttd.c
index 5e1a91e06..d69209179 100644
--- a/openttd.c
+++ b/openttd.c
@@ -9,6 +9,7 @@
 
 #define VARDEF
 #include "openttd.h"
+#include "functions.h"
 #include "mixer.h"
 #include "spritecache.h"
 #include "gfx.h"