Index: src/uk/me/parabola/mkgmap/reader/osm/MultiPolygonCutter.java
===================================================================
--- src/uk/me/parabola/mkgmap/reader/osm/MultiPolygonCutter.java	(revision 4912)
+++ src/uk/me/parabola/mkgmap/reader/osm/MultiPolygonCutter.java	(working copy)
@@ -26,6 +26,7 @@
 import java.util.Queue;
 
 import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
+import uk.me.parabola.imgfmt.Utils;
 import uk.me.parabola.imgfmt.app.Coord;
 import uk.me.parabola.log.Logger;
 import uk.me.parabola.util.Java2DConverter;
@@ -91,6 +92,10 @@
 		// create the inner areas
 		List<Area> innerAreas = new ArrayList<>(innerPolygons.size()+2);
 		for (Way innerPolygon : innerPolygons) {
+			// store original coords of inner so that the cutting creates the same Coord instances where possible
+			for (Coord p : innerPolygon.getPoints()) {
+				commonCoordMap.put(Utils.coord2Long(p), p);
+			}
 			// don't need to clip to the bounding box because 
 			// these polygons are just used to cut out holes
 			innerAreas.addAll(createAreas(innerPolygon, false));