diff --git a/hw/q35.c b/hw/q35.c
index ff570ce..5d256cb 100644
--- a/hw/q35.c
+++ b/hw/q35.c
@@ -663,9 +663,11 @@ static void ich9_lpc_update_apic(ICH9LPCIrqState *irq_state, int gsi)
 {
     GMCHPCIHost *s = container_of(irq_state, GMCHPCIHost, irq_state);
     ICH9LPCState *lpc = irq_state->lpc;
-    int level;
+    int level = 0;
 
-    level = pci_bus_get_irq_level(s->host.pci.bus, ich9_gsi_to_pirq(gsi));
+    if (gsi >= ICH9_LPC_PIC_NUM_PINS) {
+        level |= pci_bus_get_irq_level(s->host.pci.bus, ich9_gsi_to_pirq(gsi));
+    }
     if (gsi == ich9_lpc_sci_irq(lpc)) {
         level |= lpc->sci_level;
     }