diff --git a/tools/testing/selftests/net/fib_rule_tests.sh b/tools/testing/selftests/net/fib_rule_tests.sh
index 51157a5559b7..c8d1c297b7a1 100755
--- a/tools/testing/selftests/net/fib_rule_tests.sh
+++ b/tools/testing/selftests/net/fib_rule_tests.sh
@@ -87,6 +87,8 @@ setup()
 	$IP address add $DEV_ADDR/24 dev dummy0
 	$IP -6 address add $DEV_ADDR6/64 dev dummy0
 
+	ip netns exec testns sysctl -w net.ipv4.ip_forward=1
+
 	set +e
 }