diff --git a/sysmocom/suites/4g/handover.py b/sysmocom/suites/4g/handover.py
index a503465..b0837d8 100755
--- a/sysmocom/suites/4g/handover.py
+++ b/sysmocom/suites/4g/handover.py
@@ -43,7 +43,7 @@
 ue.connect(enb)
 
 iperf3srv.start()
-proc = iperf3cli.prepare_test_proc(False, ue.netns(), duration + 30)
+proc = iperf3cli.prepare_test_proc(iperf3cli.DIR_UL, ue.netns(), duration + 30)
 
 print('waiting for UE to attach...')
 wait(ue.is_connected, None)
diff --git a/sysmocom/suites/4g/iperf3_dl.py b/sysmocom/suites/4g/iperf3_dl.py
index bcc569a..66d75bb 100755
--- a/sysmocom/suites/4g/iperf3_dl.py
+++ b/sysmocom/suites/4g/iperf3_dl.py
@@ -21,7 +21,7 @@
 ue.connect(enb)
 
 iperf3srv.start()
-proc = iperf3cli.prepare_test_proc(True, ue.netns())
+proc = iperf3cli.prepare_test_proc(iperf3cli.DIR_DL, ue.netns())
 
 print('waiting for UE to attach...')
 wait(ue.is_connected, None)
diff --git a/sysmocom/suites/4g/iperf3_ul.py b/sysmocom/suites/4g/iperf3_ul.py
index a92a658..7dca127 100755
--- a/sysmocom/suites/4g/iperf3_ul.py
+++ b/sysmocom/suites/4g/iperf3_ul.py
@@ -21,7 +21,7 @@
 ue.connect(enb)
 
 iperf3srv.start()
-proc = iperf3cli.prepare_test_proc(False, ue.netns())
+proc = iperf3cli.prepare_test_proc(iperf3cli.DIR_UL, ue.netns())
 
 print('waiting for UE to attach...')
 wait(ue.is_connected, None)
diff --git a/sysmocom/suites/gprs/lib/testlib.py b/sysmocom/suites/gprs/lib/testlib.py
index 765f463..1421229 100644
--- a/sysmocom/suites/gprs/lib/testlib.py
+++ b/sysmocom/suites/gprs/lib/testlib.py
@@ -10,7 +10,7 @@
     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(False, ms_li[i].netns()))
+        procs.append(iperf3clients[i].prepare_test_proc(iperf3clients[i].DIR_UL, ms_li[i].netns()))
     try:
         for proc in procs:
             proc.launch()