diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index abeb24b7f8ec482afce3b02ef2edacaa8f50e37f..fd99485cf2a4a777a2900fb1e062069aa5236a23 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -777,6 +777,14 @@ subflows_tests()
 	ip netns exec $ns2 ./pm_nl_ctl add 10.0.2.2 flags subflow
 	run_tests $ns1 $ns2 10.0.1.1
 	chk_join_nr "multiple subflows, limited by server" 2 2 1
+
+	# single subflow, dev
+	reset
+	ip netns exec $ns1 ./pm_nl_ctl limits 0 1
+	ip netns exec $ns2 ./pm_nl_ctl limits 0 1
+	ip netns exec $ns2 ./pm_nl_ctl add 10.0.3.2 flags subflow dev ns2eth3
+	run_tests $ns1 $ns2 10.0.1.1
+	chk_join_nr "single subflow, dev" 1 1 1
 }
 
 signal_address_tests()