diff --git a/tools/python/unittests/linphonetester.py b/tools/python/unittests/linphonetester.py
index 3a32004e9..e8b462497 100644
--- a/tools/python/unittests/linphonetester.py
+++ b/tools/python/unittests/linphonetester.py
@@ -47,7 +47,6 @@ def create_address(domain):
         domain = test_route
     addr.domain = domain
     assert_equals(addr.domain, domain)
-    addr.display_name = None
     addr.display_name = "Mr Tester"
     assert_equals(addr.display_name, "Mr Tester")
     return addr
diff --git a/tools/python/unittests/test_register.py b/tools/python/unittests/test_register.py
index 71e157be8..6072d171f 100644
--- a/tools/python/unittests/test_register.py
+++ b/tools/python/unittests/test_register.py
@@ -183,7 +183,10 @@ class TestRegister:
 
     def test_transport_change(self):
         cm = CoreManager('multi_account_rc', True)
-        number_of_udp_proxies = reduce(lambda x, y: x + int(y.transport == "udp"), cm.lc.proxy_config_list, 0)
+        number_of_udp_proxies = 0
+        for p in cm.lc.proxy_config_list:
+            if p.transport == "udp":
+                number_of_udp_proxies += 1
         total_number_of_proxies = len(cm.lc.proxy_config_list)
         register_ok = cm.stats.number_of_LinphoneRegistrationOk
         # Keep only UDP