diff --git a/hw/q35_smbus.c b/hw/q35_smbus.c
index 5efbe6c..dd64aa2 100644
--- a/hw/q35_smbus.c
+++ b/hw/q35_smbus.c
@@ -97,6 +97,10 @@ static int ich9_smbus_initfn(PCIDevice *d)
 
     pci_set_word(d->wmask + PCI_STATUS,
                     PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY);
+    pci_set_word(d->w1cmask + PCI_STATUS,
+                  pci_get_word(d->w1cmask + PCI_STATUS) &
+                  ~(PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY));
+
     /* TODO? D31IP.SMIP in chipset configuration space */
     pci_config_set_interrupt_pin(d->config, 0x01); /* interrupt pin 1 */