diff --git a/src/misc_gui.cpp b/src/misc_gui.cpp
--- a/src/misc_gui.cpp
+++ b/src/misc_gui.cpp
@@ -189,7 +189,7 @@ public:
 			c->money = INT64_MAX;
 			CommandCost costclear = DoCommand(tile, 0, 0, DC_NONE, CMD_LANDSCAPE_CLEAR);
 			c->money = old_money;
-			if (CmdSucceeded(costclear)) {
+			if (costclear.Succeeded()) {
 				Money cost = costclear.GetCost();
 				if (cost < 0) {
 					cost = -cost; // Negate negative cost to a positive revenue