diff --git a/src/script/api/script_object.cpp b/src/script/api/script_object.cpp
index 3cddb12f83..7d1042156c 100644
--- a/src/script/api/script_object.cpp
+++ b/src/script/api/script_object.cpp
@@ -103,7 +103,7 @@ ScriptObject::ActiveInstance::~ActiveInstance()
 
 /* static */ void ScriptObject::SetDoCommandCosts(Money value)
 {
-	GetStorage()->costs = CommandCost(value);
+	GetStorage()->costs = CommandCost(INVALID_EXPENSES, value); // Expense type is never read.
 }
 
 /* static */ void ScriptObject::IncreaseDoCommandCosts(Money value)