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-rw-r--r--src/waypoint_cmd.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/waypoint_cmd.cpp b/src/waypoint_cmd.cpp
index 35d7745c7..1a3d6e6e9 100644
--- a/src/waypoint_cmd.cpp
+++ b/src/waypoint_cmd.cpp
@@ -289,7 +289,7 @@ CommandCost CmdBuildBuoy(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32
if (tile == 0 || !HasTileWaterGround(tile)) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
if (MayHaveBridgeAbove(tile) && IsBridgeAbove(tile)) return_cmd_error(STR_ERROR_MUST_DEMOLISH_BRIDGE_FIRST);
- if (GetTileSlope(tile) != SLOPE_FLAT) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
+ if (!IsTileFlat(tile)) return_cmd_error(STR_ERROR_SITE_UNSUITABLE);
/* Check if there is an already existing, deleted, waypoint close to us that we can reuse. */
Waypoint *wp = FindDeletedWaypointCloseTo(tile, STR_SV_STNAME_BUOY, OWNER_NONE);