diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index e101fa0..7a86a81 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -155,7 +155,7 @@ static int virtio_pci_load_config(void * opaque, QEMUFile *f)
 
     /* Try to find out if the guest has bus master disabled, but is
        in ready state. Then we have a buggy guest OS. */
-    if (!(proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
+    if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
         !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
         proxy->bugs |= VIRTIO_PCI_BUG_BUS_MASTER;
     }