diff --git a/hw/ppce500_pci.c b/hw/ppce500_pci.c
index 3fa42d2cdc..629b24235f 100644
--- a/hw/ppce500_pci.c
+++ b/hw/ppce500_pci.c
@@ -313,7 +313,7 @@ static int e500_pcihost_initfn(SysBusDevice *dev)
     cpu_register_physical_memory(registers + PCIE500_CFGADDR, 4, index);
 
     /* CFGDATA */
-    index = pci_host_data_register_mmio(&s->pci_state, 0);
+    index = pci_host_data_register_mmio(&s->pci_state, 1);
     if (index < 0)
         return -1;
     cpu_register_physical_memory(registers + PCIE500_CFGDATA, 4, index);