diff --git a/src/openrct2-ui/windows/Water.cpp b/src/openrct2-ui/windows/Water.cpp
index 467302e0e4..65569e3185 100644
--- a/src/openrct2-ui/windows/Water.cpp
+++ b/src/openrct2-ui/windows/Water.cpp
@@ -358,6 +358,7 @@ static Widget _waterWidgets[] = {
             // Move to tool bottom left
             mapTile.x -= tool_length / 2;
             mapTile.y -= tool_length / 2;
+            mapTile = mapTile.ToTileStart();
 
             if (gMapSelectPositionA.x != mapTile.x)
             {