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-rw-r--r--src/dock_gui.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/dock_gui.cpp b/src/dock_gui.cpp
index d1a76ed12..96c840561 100644
--- a/src/dock_gui.cpp
+++ b/src/dock_gui.cpp
@@ -59,7 +59,7 @@ void CcBuildCanal(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p
*/
static TileIndex GetOtherAqueductEnd(TileIndex tile_from, TileIndex *tile_to = NULL)
{
- uint z;
+ int z;
DiagDirection dir = GetInclinedSlopeDirection(GetTileSlope(tile_from, &z));
/* If the direction isn't right, just return the next tile so the command