diff --git a/VAX/vax730_uba.c b/VAX/vax730_uba.c
index 6f62419a..dc18f4ed 100644
--- a/VAX/vax730_uba.c
+++ b/VAX/vax730_uba.c
@@ -125,7 +125,7 @@ t_stat (*iodispW[IOPAGESIZE >> 1])(int32 dat, int32 ad, int32 md);
 
 /* Unibus interrupt request to interrupt action map */
 
-int32 (*int_ack[IPL_HLVL][32])();                       /* int ack routines */
+int32 (*int_ack[IPL_HLVL][32])(void);                   /* int ack routines */
 
 /* Unibus interrupt request to vector map */