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-rw-r--r--src/terraform_cmd.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/terraform_cmd.cpp b/src/terraform_cmd.cpp
index 5b476da18..9839f5e34 100644
--- a/src/terraform_cmd.cpp
+++ b/src/terraform_cmd.cpp
@@ -313,7 +313,7 @@ CommandCost CmdTerraformLand(TileIndex tile, DoCommandFlag flags, uint32 p1, uin
for (TileIndexSet::const_iterator it = ts.dirty_tiles.begin(); it != ts.dirty_tiles.end(); it++) {
MarkTileDirtyByTile(*it);
TileIndexToHeightMap::const_iterator new_height = ts.tile_to_new_height.find(tile);
- if (new_height != ts.tile_to_new_height.end()) continue;
+ if (new_height == ts.tile_to_new_height.end()) continue;
MarkTileDirtyByTile(*it, 0, new_height->second);
}