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-rw-r--r--station_cmd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/station_cmd.c b/station_cmd.c
index 1e99d3eb1..2d914fbf3 100644
--- a/station_cmd.c
+++ b/station_cmd.c
@@ -1672,7 +1672,7 @@ int32 CmdBuildAirport(int x, int y, uint32 flags, uint32 p1, uint32 p2)
SET_EXPENSES_TYPE(EXPENSES_CONSTRUCTION);
/* Check if a valid, buildable airport was chosen for construction */
- if (!HASBIT(GetValidAirports(), p1)) return CMD_ERROR;
+ if (p1 > lengthof(_airport_map5_tiles) || !HASBIT(GetValidAirports(), p1)) return CMD_ERROR;
tile = TILE_FROM_XY(x,y);