--- a/misc_gui.c	Sat Dec 10 11:16:45 2005 +0000
+++ b/misc_gui.c	Sat Dec 10 12:05:39 2005 +0000
@@ -59,7 +59,7 @@
 		DrawStringCentered(140, 27, STR_01A7_OWNER, 0);
 
 		str = STR_01A4_COST_TO_CLEAR_N_A;
-		if (lid->costclear != CMD_ERROR) {
+		if (!CmdFailed(lid->costclear)) {
 			SetDParam(0, lid->costclear);
 			str = STR_01A5_COST_TO_CLEAR;
 		}