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-rw-r--r--airport_gui.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/airport_gui.c b/airport_gui.c
index a1cd6e0c0..5af423ba6 100644
--- a/airport_gui.c
+++ b/airport_gui.c
@@ -2,6 +2,7 @@
#include "openttd.h"
#include "table/sprites.h"
#include "table/strings.h"
+#include "functions.h"
#include "map.h"
#include "window.h"
#include "gui.h"