diff --git a/hw/isa/i82378.c b/hw/isa/i82378.c
index a542134585..9b8674a0fb 100644
--- a/hw/isa/i82378.c
+++ b/hw/isa/i82378.c
@@ -45,7 +45,6 @@ typedef struct I82378State {
 typedef struct PCIi82378State {
     PCIDevice pci_dev;
     uint32_t isa_io_base;
-    uint32_t isa_mem_base;
     I82378State state;
 } PCIi82378State;
 
@@ -234,7 +233,6 @@ static int pci_i82378_init(PCIDevice *dev)
     pci_set_long(dev->wmask + PCI_BASE_ADDRESS_0, 0);
     pci_set_long(pci_conf + PCI_BASE_ADDRESS_0, pci->isa_io_base);
 
-    isa_mem_base = pci->isa_mem_base;
     isa_bus_new(&dev->qdev, pci_address_space_io(dev));
 
     i82378_init(&dev->qdev, s);
@@ -244,7 +242,6 @@ static int pci_i82378_init(PCIDevice *dev)
 
 static Property i82378_properties[] = {
     DEFINE_PROP_HEX32("iobase", PCIi82378State, isa_io_base, 0x80000000),
-    DEFINE_PROP_HEX32("membase", PCIi82378State, isa_mem_base, 0xc0000000),
     DEFINE_PROP_END_OF_LIST()
 };
 
diff --git a/hw/pci-host/prep.c b/hw/pci-host/prep.c
index 09d3b32291..e120058511 100644
--- a/hw/pci-host/prep.c
+++ b/hw/pci-host/prep.c
@@ -119,6 +119,8 @@ static void raven_pcihost_realizefn(DeviceState *d, Error **errp)
     MemoryRegion *address_space_mem = get_system_memory();
     int i;
 
+    isa_mem_base = 0xc0000000;
+
     for (i = 0; i < 4; i++) {
         sysbus_init_irq(dev, &s->irq[i]);
     }