diff --git a/src/saveload/order_sl.cpp b/src/saveload/order_sl.cpp
--- a/src/saveload/order_sl.cpp
+++ b/src/saveload/order_sl.cpp
@@ -302,7 +302,12 @@ void Load_BKOR()
 	 * Furthermore before savegame version 192 the actual content was always corrupt.
 	 */
 	if (!_networking || _network_server || IsSavegameVersionBefore(192)) {
-		_order_backup_pool.CleanPool();
+		/* Note: We cannot use CleanPool since that skips part of the destructor
+		 * and then leaks un-reachable Orders in the order pool. */
+		OrderBackup *ob;
+		FOR_ALL_ORDER_BACKUPS(ob) {
+			delete ob;
+		}
 	}
 }