diff --git a/hw/pci-host/designware.c b/hw/pci-host/designware.c
index 9e183caa48..388d252ee2 100644
--- a/hw/pci-host/designware.c
+++ b/hw/pci-host/designware.c
@@ -694,6 +694,7 @@ static void designware_pcie_host_realize(DeviceState *dev, Error **errp)
                                      &s->pci.io,
                                      0, 4,
                                      TYPE_PCIE_BUS);
+    pci->bus->flags |= PCI_BUS_EXTENDED_CONFIG_SPACE;
 
     memory_region_init(&s->pci.address_space_root,
                        OBJECT(s),