diff --git a/hw/spapr.c b/hw/spapr.c
index 884c6673ec..109b77459a 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -362,8 +362,9 @@ static void ppc_spapr_init(ram_addr_t ram_size,
 
     for (i = 0; i < MAX_SERIAL_PORTS; i++, irq++) {
         if (serial_hds[i]) {
-            spapr_vty_create(spapr->vio_bus, i, serial_hds[i],
-                             xics_find_qirq(spapr->icp, irq), irq);
+            spapr_vty_create(spapr->vio_bus, SPAPR_VTY_BASE_ADDRESS + i,
+                             serial_hds[i], xics_find_qirq(spapr->icp, irq),
+                             irq);
         }
     }
 
diff --git a/hw/spapr_rtas.c b/hw/spapr_rtas.c
index 16b65422b6..00c8ce5a15 100644
--- a/hw/spapr_rtas.c
+++ b/hw/spapr_rtas.c
@@ -44,7 +44,8 @@ static void rtas_display_character(sPAPREnvironment *spapr,
                                    uint32_t nret, target_ulong rets)
 {
     uint8_t c = rtas_ld(args, 0);
-    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, 0);
+    VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus,
+                                                 SPAPR_VTY_BASE_ADDRESS);
 
     if (!sdev) {
         rtas_st(rets, 0, -1);
diff --git a/hw/spapr_vio.h b/hw/spapr_vio.h
index 841b04351a..603a8c43a3 100644
--- a/hw/spapr_vio.h
+++ b/hw/spapr_vio.h
@@ -32,6 +32,8 @@ enum VIOsPAPR_TCEAccess {
     SPAPR_TCE_RW = 3,
 };
 
+#define SPAPR_VTY_BASE_ADDRESS     0x30000000
+
 struct VIOsPAPRDevice;
 
 typedef struct VIOsPAPR_RTCE {