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-rw-r--r--src/ai/trolly/trolly.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ai/trolly/trolly.h b/src/ai/trolly/trolly.h
index a1d8e0cd9..60180694c 100644
--- a/src/ai/trolly/trolly.h
+++ b/src/ai/trolly/trolly.h
@@ -10,6 +10,7 @@
#include "../../vehicle_type.h"
#include "../../date_type.h"
#include "../../engine_type.h"
+#include "../../direction_type.h"
/*
* These defines can be altered to change the behavoir of the AI