diff -r f540f1fb6bd9 -r 2e1e4d2f71dd src/misc_cmd.cpp
--- a/src/misc_cmd.cpp	Sun May 25 20:00:10 2008 +0000
+++ b/src/misc_cmd.cpp	Sun May 25 22:36:44 2008 +0000
@@ -395,11 +395,11 @@
 {
 	if (p1 != (uint32)-1L && ((int32)p1 >= GAME_DIFFICULTY_NUM || (int32)p1 < 0)) return CMD_ERROR;
 
-	GameOptions *opt_ptr = (_game_mode == GM_MENU) ? &_opt_newgame : &_opt;
+	DifficultySettings *opt_ptr = (_game_mode == GM_MENU) ? &_settings_newgame.difficulty : &_settings.difficulty;
 
 	if (flags & DC_EXEC) {
 		if (p1 != (uint32)-1L) {
-			((GDType*)&opt_ptr->diff)[p1] = p2;
+			((GDType*)opt_ptr)[p1] = p2;
 			opt_ptr->diff_level = 3; // custom difficulty level
 		} else {
 			opt_ptr->diff_level = p2;