diff --git a/suites/4g/iperf3.py b/suites/4g/iperf3.py
index 5ccc922..cc7bca0 100755
--- a/suites/4g/iperf3.py
+++ b/suites/4g/iperf3.py
@@ -32,7 +32,7 @@
 ue.connect(enb)
 
 iperf3srv.start()
-proc = iperf3cli.prepare_test_proc(ue.netns())
+proc = iperf3cli.prepare_test_proc(False, ue.netns())
 
 print('waiting for UE to attach...')
 wait(ue.is_connected, None)
diff --git a/suites/gprs/lib/testlib.py b/suites/gprs/lib/testlib.py
index 284ca63..c0af372 100644
--- a/suites/gprs/lib/testlib.py
+++ b/suites/gprs/lib/testlib.py
@@ -16,7 +16,7 @@
     procs = []
     for i in range(len(iperf3clients)):
         print("Running iperf3 client to %s through %r" % (str(iperf3clients[i]), repr(ms_li[i].tmp_ctx_id)))
-        procs.append(iperf3clients[i].prepare_test_proc(ms_li[i].netns()))
+        procs.append(iperf3clients[i].prepare_test_proc(False, ms_li[i].netns()))
     try:
         for proc in procs:
             proc.launch()