Index: src/clear_cmd.cpp
===================================================================
--- src/clear_cmd.cpp	(revision 27115)
+++ src/clear_cmd.cpp	(working copy)
@@ -112,7 +112,7 @@
 			break;
 
 		case CLEAR_ROCKS:
-			DrawGroundSprite(SPR_FLAT_ROCKY_LAND_1 + SlopeToSpriteOffset(ti->tileh), PAL_NONE);
+			DrawGroundSprite((GB(ti->x ^ ti->y, 4, 1) ? SPR_FLAT_ROCKY_LAND_2 : SPR_FLAT_ROCKY_LAND_1) + SlopeToSpriteOffset(ti->tileh), PAL_NONE);
 			break;
 
 		case CLEAR_FIELDS: