diff --git a/src/functions.h b/src/functions.h
index 1d33d70cb7..d92ea85ab2 100644
--- a/src/functions.h
+++ b/src/functions.h
@@ -25,13 +25,6 @@ bool CheckTileOwnership(TileIndex tile);
 void InitializeLandscapeVariables(bool only_constants);
 
 /* misc functions */
-/**
- * Mark a tile given by its coordinate dirty for repaint.
- *
- * @ingroup dirty
- */
-void MarkTileDirty(int x, int y);
-
 /**
  * Mark a tile given by its index dirty for repaint.
  *
diff --git a/src/rail_gui.cpp b/src/rail_gui.cpp
index 678d0fc93e..bb26cb00c0 100644
--- a/src/rail_gui.cpp
+++ b/src/rail_gui.cpp
@@ -675,7 +675,7 @@ struct BuildRailToolbarWindow : Window {
 				break;
 			}
 		}
-		MarkTileDirty(_thd.pos.x, _thd.pos.y); // redraw tile selection
+		MarkTileDirtyByTile(TileVirtXY(_thd.pos.x, _thd.pos.y)); // redraw tile selection
 		return state;
 	}
 
diff --git a/src/road_gui.cpp b/src/road_gui.cpp
index e041a08f4b..d2241180c5 100644
--- a/src/road_gui.cpp
+++ b/src/road_gui.cpp
@@ -507,7 +507,7 @@ struct BuildRoadToolbarWindow : Window {
 				break;
 			}
 		}
-		MarkTileDirty(_thd.pos.x, _thd.pos.y); // redraw tile selection
+		MarkTileDirtyByTile(TileVirtXY(_thd.pos.x, _thd.pos.y)); // redraw tile selection
 		return state;
 	}
 
diff --git a/src/viewport.cpp b/src/viewport.cpp
index aa32bc96d6..32bea397e5 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -1709,18 +1709,6 @@ void MarkTileDirtyByTile(TileIndex tile)
 	);
 }
 
-void MarkTileDirty(int x, int y)
-{
-	Point pt = RemapCoords(x, y, GetTileZ(TileVirtXY(x, y)));
-
-	MarkAllViewportsDirty(
-		pt.x - 31,
-		pt.y - 122,
-		pt.x - 31 + 67,
-		pt.y - 122 + 154
-	);
-}
-
 /**
  * Marks the selected tiles as dirty.
  *