diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
index af93557a9a..db27872963 100644
--- a/hw/scsi/lsi53c895a.c
+++ b/hw/scsi/lsi53c895a.c
@@ -2302,6 +2302,12 @@ static void lsi_scsi_realize(PCIDevice *dev, Error **errp)
     memory_region_init_io(&s->io_io, OBJECT(s), &lsi_io_ops, s,
                           "lsi-io", 256);
 
+    /*
+     * Since we use the address-space API to interact with ram_io, disable the
+     * re-entrancy guard.
+     */
+    s->ram_io.disable_reentrancy_guard = true;
+
     address_space_init(&s->pci_io_as, pci_address_space_io(dev), "lsi-pci-io");
     qdev_init_gpio_out(d, &s->ext_irq, 1);