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-rw-r--r--src/aircraft_cmd.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/aircraft_cmd.cpp b/src/aircraft_cmd.cpp
index e4d5b44ab..a022ba47b 100644
--- a/src/aircraft_cmd.cpp
+++ b/src/aircraft_cmd.cpp
@@ -606,7 +606,7 @@ int32 CmdRefitAircraft(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
/* Check cargo */
CargoID new_cid = GB(p2, 0, 8);
- if (new_cid > NUM_CARGO || !CanRefitTo(v->engine_type, new_cid)) return CMD_ERROR;
+ if (new_cid >= NUM_CARGO || !CanRefitTo(v->engine_type, new_cid)) return CMD_ERROR;
SET_EXPENSES_TYPE(EXPENSES_AIRCRAFT_RUN);