diff --git a/hw/ioh3420.c b/hw/ioh3420.c
index d706e19..95bceb5 100644
--- a/hw/ioh3420.c
+++ b/hw/ioh3420.c
@@ -226,7 +226,7 @@
     dc->props = ioh3420_properties;
 }
 
-static TypeInfo ioh3420_info = {
+static const TypeInfo ioh3420_info = {
     .name          = "ioh3420",
     .parent        = TYPE_PCI_DEVICE,
     .instance_size = sizeof(PCIESlot),