diff --git a/hw/ppc/pnv_xscom.c b/hw/ppc/pnv_xscom.c
index 8557b560ae..dc1ffc6c01 100644
--- a/hw/ppc/pnv_xscom.c
+++ b/hw/ppc/pnv_xscom.c
@@ -61,6 +61,8 @@ static uint32_t pnv_xscom_pcba(PnvChip *chip, uint64_t addr)
 static uint64_t xscom_read_default(PnvChip *chip, uint32_t pcba)
 {
     switch (pcba) {
+    case 0x10005:       /* SECURITY SWITCH */
+        return 0;
     case 0xf000f:
         return PNV_CHIP_GET_CLASS(chip)->chip_cfam_id;
     case 0x18002:       /* ECID2 */