diff --git a/hw/e1000.c b/hw/e1000.c
index 14c8297b31..e6155d6a69 100644
--- a/hw/e1000.c
+++ b/hw/e1000.c
@@ -1034,6 +1034,16 @@ e1000_mmio_map(PCIDevice *pci_dev, int region_num,
                                      excluded_regs[i] - 4);
 }
 
+static int
+pci_e1000_uninit(PCIDevice *dev)
+{
+    E1000State *d = (E1000State *) dev;
+
+    cpu_unregister_io_memory(d->mmio_index);
+
+    return 0;
+}
+
 PCIDevice *
 pci_e1000_init(PCIBus *bus, NICInfo *nd, int devfn)
 {
@@ -1092,6 +1102,7 @@ pci_e1000_init(PCIBus *bus, NICInfo *nd, int devfn)
     qemu_format_nic_info_str(d->vc, d->nd->macaddr);
 
     register_savevm(info_str, -1, 2, nic_save, nic_load, d);
+    d->dev.unregister = pci_e1000_uninit;
 
     return (PCIDevice *)d;
 }
diff --git a/hw/lsi53c895a.c b/hw/lsi53c895a.c
index 6991a60325..36ee28e714 100644
--- a/hw/lsi53c895a.c
+++ b/hw/lsi53c895a.c
@@ -1962,6 +1962,18 @@ void lsi_scsi_attach(void *opaque, BlockDriverState *bd, int id)
     bd->private = &s->pci_dev;
 }
 
+static int lsi_scsi_uninit(PCIDevice *d)
+{
+    LSIState *s = (LSIState *) d;
+
+    cpu_unregister_io_memory(s->mmio_io_addr);
+    cpu_unregister_io_memory(s->ram_io_addr);
+
+    qemu_free(s->queue);
+
+    return 0;
+}
+
 void *lsi_scsi_init(PCIBus *bus, int devfn)
 {
     LSIState *s;
@@ -2004,6 +2016,7 @@ void *lsi_scsi_init(PCIBus *bus, int devfn)
     s->queue = qemu_malloc(sizeof(lsi_queue));
     s->queue_len = 1;
     s->active_commands = 0;
+    s->pci_dev.unregister = lsi_scsi_uninit;
 
     lsi_soft_reset(s);