diff --git a/tests/fs/nfs/t_rquotad.sh b/tests/fs/nfs/t_rquotad.sh
index 8314eef52f45..05cd8e0e240c 100644
--- a/tests/fs/nfs/t_rquotad.sh
+++ b/tests/fs/nfs/t_rquotad.sh
@@ -1,4 +1,4 @@
-# $NetBSD: t_rquotad.sh,v 1.9 2020/08/20 13:58:30 riastradh Exp $
+# $NetBSD: t_rquotad.sh,v 1.10 2023/05/28 08:17:00 hannken Exp $
 #
 #  Copyright (c) 2011 Manuel Bouyer
 #  All rights reserved.
@@ -110,7 +110,8 @@ get_nfs_quota()
 	/bin/echo "/export -noresvport -noresvmnt 10.1.1.100" | \
 		dd of=/rump/etc/exports 2> /dev/null
 
-	atf_check -s exit:0 -e ignore mount_ffs /dk /rump/export
+	atf_check -s exit:0 -e ignore env RUMPHIJACK='path=/rump,blanket=/dk' \
+		mount_ffs /dk /rump/export
 
 #set a quota limit (and check that we can read it back)
 	for q in ${expect} ; do
diff --git a/tests/lib/librumphijack/t_tcpip.sh b/tests/lib/librumphijack/t_tcpip.sh
index 2712ea16c229..03ae43ba10e1 100644
--- a/tests/lib/librumphijack/t_tcpip.sh
+++ b/tests/lib/librumphijack/t_tcpip.sh
@@ -1,4 +1,4 @@
-#       $NetBSD: t_tcpip.sh,v 1.21 2021/11/11 07:38:21 gson Exp $
+#       $NetBSD: t_tcpip.sh,v 1.22 2023/05/28 08:17:00 hannken Exp $
 #
 # Copyright (c) 2011 The NetBSD Foundation, Inc.
 # All rights reserved.
@@ -182,7 +182,8 @@ test_nfs()
 
 	atf_check -s exit:0 rump.sysctl -q -w kern.module.autoload=1
 
-	atf_check -s exit:0 -e ignore mount_ffs /dk /rump/export
+	atf_check -s exit:0 -e ignore env RUMPHIJACK='path=/rump,blanket=/dk' \
+		mount_ffs /dk /rump/export
 	atf_check -s exit:0 -x "echo ${magicstr} > /rump/export/im_alive"
 
 	# start rpcbind.  we want /var/run/rpcbind.sock
diff --git a/tests/lib/librumphijack/t_vfs.sh b/tests/lib/librumphijack/t_vfs.sh
index c803e2a1974c..29c20676c60c 100644
--- a/tests/lib/librumphijack/t_vfs.sh
+++ b/tests/lib/librumphijack/t_vfs.sh
@@ -1,4 +1,4 @@
-#       $NetBSD: t_vfs.sh,v 1.6 2012/08/04 03:56:47 riastradh Exp $
+#       $NetBSD: t_vfs.sh,v 1.7 2023/05/28 08:17:00 hannken Exp $
 #
 # Copyright (c) 2011 The NetBSD Foundation, Inc.
 # All rights reserved.
@@ -35,7 +35,8 @@ domount()
 
 	mntdir=$1
 	[ $# -eq 0 ] && mntdir=/rump/mnt
-	atf_check -s exit:0 -e ignore mount_ffs /img ${mntdir}
+	atf_check -s exit:0 -e ignore env RUMPHIJACK='path=/rump,blanket=/img' \
+		mount_ffs /img ${mntdir}
 }
 
 dounmount()