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-rw-r--r--src/newgrf.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 2f02b049b..4759c8a19 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -3750,7 +3750,7 @@ static ChangeInfoResult AirportChangeInfo(uint airport, int numinfo, int prop, B
const AirportTileTable *copy_from;
try {
for (byte j = 0; j < as->num_table; j++) {
- as->rotation[j] = (Direction)buf->ReadByte();
+ const_cast<Direction&>(as->rotation[j]) = (Direction)buf->ReadByte();
for (int k = 0;; k++) {
att[k].ti.x = buf->ReadByte(); // Offsets from northermost tile
att[k].ti.y = buf->ReadByte();