diff -r 622136ed6c62 -r 9148590f009d algorithm.c
--- a/algorithm.c	Sat May 06 13:24:06 2006 +0200
+++ b/algorithm.c	Sat May 06 15:42:06 2006 +0200
@@ -395,7 +395,7 @@
 	return num_box_movements;
 }
 
-static void force_move_box(struct Map *m, struct BoxMove move)
+static void force_move_box(struct Map *m, const struct BoxMove move)
 {
 	struct Position newpos;