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-rw-r--r--src/openttd.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/openttd.h b/src/openttd.h
index 5514c2165..2fdf8e0a9 100644
--- a/src/openttd.h
+++ b/src/openttd.h
@@ -69,7 +69,9 @@ typedef uint16 SignID;
typedef uint16 GroupID;
typedef uint16 EngineRenewID;
typedef uint16 DestinationID;
-typedef int64 Money;
+
+typedef OverflowSafeInt<int64, INT64_MAX, INT64_MIN> OverflowSafeInt64;
+typedef OverflowSafeInt64 Money;
/* DestinationID must be at least as large as every these below, because it can
* be any of them