diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 4759c8a19c..704892e5cf 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -3672,6 +3672,9 @@ static void DuplicateTileTable(AirportSpec *as)
 	HangarTileTable *depot_table = MallocT<HangarTileTable>(as->nof_depots);
 	MemCpyT(depot_table, as->depot_table, as->nof_depots);
 	as->depot_table = depot_table;
+	Direction *rotation = MallocT<Direction>(as->num_table);
+	MemCpyT(rotation, as->rotation, as->num_table);
+	as->rotation = rotation;
 }
 
 /**
@@ -3741,6 +3744,7 @@ static ChangeInfoResult AirportChangeInfo(uint airport, int numinfo, int prop, B
 			}
 
 			case 0x0A: { // Set airport layout
+				free(as->rotation);
 				as->num_table = buf->ReadByte(); // Number of layaouts
 				as->rotation = MallocT<Direction>(as->num_table);
 				uint32 defsize = buf->ReadDWord();  // Total size of the definition