diff --git a/sys/alpha/include/types.h b/sys/alpha/include/types.h
index cf282de6b53f..ccb77934068d 100644
--- a/sys/alpha/include/types.h
+++ b/sys/alpha/include/types.h
@@ -67,7 +67,7 @@ typedef	unsigned long	uintfptr_t;
 /* Interrupt mask (spl, xxx_imask, etc) */
 typedef __uint32_t		intrmask_t;
 
-/* Interrupt handler function type - arg should be "void *" one day */
-typedef void			inthand2_t(int _unit);
+/* Interrupt handler function type */
+typedef void			inthand2_t(void *);
 
 #endif	/* _MACHTYPES_H_ */