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-rw-r--r--src/clear_cmd.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/clear_cmd.cpp b/src/clear_cmd.cpp
index 3a5434afd..c69ff0d99 100644
--- a/src/clear_cmd.cpp
+++ b/src/clear_cmd.cpp
@@ -116,7 +116,7 @@ static int TerraformProc(TerraformerState *ts, TileIndex tile, int mode)
* basement and then you raise/lower the other corner. */
tileh = GetTileSlope(tile, &z);
if (tileh == unsafe_slope[mode] ||
- tileh == SLOPE_STEEP | ComplementSlope(unsafe_slope[mode])) {
+ tileh == (SLOPE_STEEP | ComplementSlope(unsafe_slope[mode]))) {
_terraform_err_tile = tile;
_error_message = STR_1008_MUST_REMOVE_RAILROAD_TRACK;
return -1;