diff --git a/src/emu/machine/scsi.c b/src/emu/machine/scsi.c
index 0c3a9b858de..2922e1e5099 100644
--- a/src/emu/machine/scsi.c
+++ b/src/emu/machine/scsi.c
@@ -105,7 +105,7 @@ int SCSIBase( const SCSIClass *scsiClass, int operation, void *file, INT64 intpa
 
 SCSIInstance *SCSIMalloc( running_machine *machine, const SCSIClass *scsiClass )
 {
-	SCSIInstance *scsiInstance = alloc_or_die(SCSIInstance);
+	SCSIInstance *scsiInstance = (SCSIInstance *)alloc_array_or_die(UINT8, SCSISizeof( scsiClass ));
 	scsiInstance->scsiClass = scsiClass;
 	scsiInstance->machine = machine;
 	return scsiInstance;