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-rw-r--r--yapf/yapf_costbase.hpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/yapf/yapf_costbase.hpp b/yapf/yapf_costbase.hpp
index 7aa141bc8..27fbe5e67 100644
--- a/yapf/yapf_costbase.hpp
+++ b/yapf/yapf_costbase.hpp
@@ -8,7 +8,7 @@ struct CYapfCostBase {
FORCEINLINE static bool stSlopeCost(TileIndex tile, Trackdir td)
{
- if (IsDiagonalTrackdir(td)) {
+ if (IsDiagonalTrackdir(td) && !IsTunnelTile(tile)) {
uint tile_slope = GetTileSlope(tile, NULL) & 0x0F;
if ((c_upwards_slopes[tile_slope] & TrackdirToTrackdirBits(td)) != 0) {
return true;