diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 12008640d9f4..84c21282ee46 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -12,7 +12,6 @@ cout=""
 ksft_skip=4
 timeout_poll=30
 timeout_test=$((timeout_poll * 2 + 1))
-mptcp_connect=""
 capture=0
 checksum=0
 ip_mptcp=0
@@ -444,12 +443,13 @@ do_transfer()
 	NSTAT_HISTORY=/tmp/${connector_ns}.nstat ip netns exec ${connector_ns} \
 		nstat -n
 
+	local extra_args
 	if [ $speed = "fast" ]; then
-		mptcp_connect="./mptcp_connect -j"
+		extra_args="-j"
 	elif [ $speed = "slow" ]; then
-		mptcp_connect="./mptcp_connect -r 50"
-	elif [ $speed = "least" ]; then
-		mptcp_connect="./mptcp_connect -r 10"
+		extra_args="-r 50"
+	elif [[ $speed = "speed_"* ]]; then
+		extra_args="-r ${speed:6}"
 	fi
 
 	local local_addr
@@ -462,13 +462,13 @@ do_transfer()
 	if [ "$test_link_fail" -eq 2 ];then
 		timeout ${timeout_test} \
 			ip netns exec ${listener_ns} \
-				$mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
-					${local_addr} < "$sinfail" > "$sout" &
+				./mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
+					$extra_args ${local_addr} < "$sinfail" > "$sout" &
 	else
 		timeout ${timeout_test} \
 			ip netns exec ${listener_ns} \
-				$mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
-					${local_addr} < "$sin" > "$sout" &
+				./mptcp_connect -t ${timeout_poll} -l -p $port -s ${srv_proto} \
+					$extra_args ${local_addr} < "$sin" > "$sout" &
 	fi
 	spid=$!
 
@@ -477,15 +477,15 @@ do_transfer()
 	if [ "$test_link_fail" -eq 0 ];then
 		timeout ${timeout_test} \
 			ip netns exec ${connector_ns} \
-				$mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
-					$connect_addr < "$cin" > "$cout" &
+				./mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
+					$extra_args $connect_addr < "$cin" > "$cout" &
 	else
 		( cat "$cinfail" ; sleep 2; link_failure $listener_ns ; cat "$cinfail" ) | \
 			tee "$cinsent" | \
 			timeout ${timeout_test} \
 				ip netns exec ${connector_ns} \
-					$mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
-						$connect_addr > "$cout" &
+					./mptcp_connect -t ${timeout_poll} -p $port -s ${cl_proto} \
+						$extra_args $connect_addr > "$cout" &
 	fi
 	cpid=$!
 
@@ -1507,7 +1507,7 @@ add_addr_timeout_tests()
 	pm_nl_add_endpoint $ns1 10.0.2.1 flags signal
 	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
 	pm_nl_set_limits $ns2 2 2
-	run_tests $ns1 $ns2 10.0.1.1 0 0 0 least
+	run_tests $ns1 $ns2 10.0.1.1 0 0 0 speed_10
 	chk_join_nr "signal addresses, ADD_ADDR timeout" 2 2 2
 	chk_add_nr 8 0
 
@@ -1517,7 +1517,7 @@ add_addr_timeout_tests()
 	pm_nl_add_endpoint $ns1 10.0.12.1 flags signal
 	pm_nl_add_endpoint $ns1 10.0.3.1 flags signal
 	pm_nl_set_limits $ns2 2 2
-	run_tests $ns1 $ns2 10.0.1.1 0 0 0 least
+	run_tests $ns1 $ns2 10.0.1.1 0 0 0 speed_10
 	chk_join_nr "invalid address, ADD_ADDR timeout" 1 1 1
 	chk_add_nr 8 0
 }