diff --git a/tests/hwsim/test_cfg80211.py b/tests/hwsim/test_cfg80211.py
index 3e57d08d1..239b5105f 100644
--- a/tests/hwsim/test_cfg80211.py
+++ b/tests/hwsim/test_cfg80211.py
@@ -95,7 +95,16 @@ def test_cfg80211_tx_frame(dev, apdev, params):
         pass
 
     if cmd:
-        freq = cmd.stdout.read().splitlines()
+        (out,err) = cmd.communicate()
+        res = cmd.wait()
+        if res == 1:
+            arg[3] = '-R'
+            cmd = subprocess.Popen(arg, stdout=subprocess.PIPE,
+                                   stderr=open('/dev/null', 'w'))
+            (out,err) = cmd.communicate()
+            res = cmd.wait()
+
+        freq = out.splitlines()
         if len(freq) != 2:
             raise Exception("Unexpected number of Action frames (%d)" % len(freq))
         if freq[0] != "2422":
diff --git a/tests/hwsim/test_p2p_channel.py b/tests/hwsim/test_p2p_channel.py
index e980e7a59..19cad6ea9 100644
--- a/tests/hwsim/test_p2p_channel.py
+++ b/tests/hwsim/test_p2p_channel.py
@@ -144,8 +144,17 @@ def test_p2p_channel_random_social_with_op_class_change(dev, apdev, params):
             pass
 
         if cmd:
+            (out,err) = cmd.communicate()
+            res = cmd.wait()
+            if res == 1:
+                arg[3] = '-R'
+                cmd = subprocess.Popen(arg, stdout=subprocess.PIPE,
+                                       stderr=open('/dev/null', 'w'))
+                (out,err) = cmd.communicate()
+                res = cmd.wait()
+
             last = None
-            for l in cmd.stdout.read().splitlines():
+            for l in out.splitlines():
                 if "Operating Channel:" not in l:
                     continue
                 last = l