diff --git a/hw/alpha_sys.h b/hw/alpha_sys.h
index 7604d09..69929ea 100644
--- a/hw/alpha_sys.h
+++ b/hw/alpha_sys.h
@@ -11,7 +11,7 @@
 #include "irq.h"
 
 
-PCIBus *typhoon_init(ram_addr_t, ISABus **, qemu_irq *, CPUAlphaState *[4],
+PCIBus *typhoon_init(ram_addr_t, ISABus **, qemu_irq *, AlphaCPU *[4],
                      pci_map_irq_fn);
 
 /* alpha_pci.c.  */