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-rw-r--r--src/transparency.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/transparency.h b/src/transparency.h
index 3b5cd5ebe..a6a33eaf0 100644
--- a/src/transparency.h
+++ b/src/transparency.h
@@ -14,6 +14,7 @@
#include "gfx_func.h"
#include "openttd.h"
+#include "core/bitmath_func.hpp"
/**
* Transparency option bits: which position in _transparency_opt stands for which transparency.