diff --git a/machines/machinetnt.cpp b/machines/machinetnt.cpp
index ca9d947..9f10d72 100644
--- a/machines/machinetnt.cpp
+++ b/machines/machinetnt.cpp
@@ -73,7 +73,7 @@ int initialize_tnt(std::string& id)
         DEV_FUN(0x10,0), gc_obj);
 
     // get video PCI controller object
-    PCIHost *vci_host = dynamic_cast<PCIHost*>(gMachineObj->get_comp_by_name("Chaos"));
+    PCIHost *vci_host = dynamic_cast<PCIHost*>(gMachineObj->get_comp_by_name_optional("Chaos"));
     if (vci_host) {
         vci_host->set_irq_map(chaos_irq_map);
         // connect built-in video device to the VCI bus