diff --git a/tests/ifdown_test b/tests/ifdown_test
index 8f2e7bf..2ca83c3 100755
--- a/tests/ifdown_test
+++ b/tests/ifdown_test
@@ -30,56 +30,56 @@ noargs_body() {
 
 lo_always_auto_body() {
 	atf_check -s exit:0 -e ignore -o match:'executors/link' \
-		ifdown -S/dev/null -E $EXECUTORS -i/dev/null -n -a
+		ifdown -f -S/dev/null -E $EXECUTORS -i/dev/null -n -a
 }
 
 dual_stack_body() {
 	atf_check -s exit:0 -e ignore \
 		-o match:'executors/link' \
 		-o match:'executors/static' \
-		ifdown -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0.interfaces -n -a
+		ifdown -f -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0.interfaces -n -a
 }
 
 static_ipv4_body() {
 	atf_check -s exit:0 -e ignore \
 		-o match:'executors/link' \
 		-o match:'executors/static' \
-		ifdown -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0-v4.interfaces -n -a
+		ifdown -f -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0-v4.interfaces -n -a
 }
 
 static_ipv4_netmask_body() {
 	atf_check -s exit:0 -e ignore \
 		-o match:'executors/link' \
 		-o match:'executors/static' \
-		ifdown -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0-v4-netmask.interfaces -n -a
+		ifdown -f -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0-v4-netmask.interfaces -n -a
 }
 
 static_ipv6_body() {
 	atf_check -s exit:0 -e ignore \
 		-o match:'executors/link' \
 		-o match:'executors/static' \
-		ifdown -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0-v6.interfaces -n -a
+		ifdown -f -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0-v6.interfaces -n -a
 }
 
 static_ipv6_netmask_body() {
 	atf_check -s exit:0 -e ignore \
 		-o match:'executors/link' \
 		-o match:'executors/static' \
-		ifdown -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0-v6-netmask.interfaces -n -a
+		ifdown -f -S/dev/null -E $EXECUTORS -i $FIXTURES/static-eth0-v6-netmask.interfaces -n -a
 }
 
 inet_dhcp_body() {
 	atf_check -s exit:0 -e ignore \
 		-o match:'executors/link' \
 		-o match:'executors/dhcp' \
-		ifdown -S/dev/null -E $EXECUTORS -i $FIXTURES/dhcp-eth0.interfaces -n -a
+		ifdown -f -S/dev/null -E $EXECUTORS -i $FIXTURES/dhcp-eth0.interfaces -n -a
 }
 
 use_dhcp_body() {
 	atf_check -s exit:0 -e ignore \
 		-o match:'executors/link' \
 		-o match:'executors/dhcp' \
-		ifdown -S/dev/null -E $EXECUTORS -i $FIXTURES/use-dhcp-eth0.interfaces -n -a
+		ifdown -f -S/dev/null -E $EXECUTORS -i $FIXTURES/use-dhcp-eth0.interfaces -n -a
 }
 
 alias_eth0_home_body() {