diff --git a/sys/dev/advansys/adv_isa.c b/sys/dev/advansys/adv_isa.c
index 7162a9bd2e61..b8c5e3fe8372 100644
--- a/sys/dev/advansys/adv_isa.c
+++ b/sys/dev/advansys/adv_isa.c
@@ -226,7 +226,7 @@ adv_isa_probe(device_t dev)
 					   /*filter*/NULL,
 					   /*filterarg*/NULL,
 					   maxsize,
-					   /*nsegs*/BUS_SPACE_UNRESTRICTED,
+					   /*nsegs*/~0,
 					   maxsegsz,
 					   /*flags*/0,
 					   &adv->parent_dmat);