diff --git a/features/FEATURE_LWIP/TESTS/mbedmicro-net/host_tests/tcp_echo_client.py b/features/FEATURE_LWIP/TESTS/mbedmicro-net/host_tests/tcp_echo_client.py
index 51a3c21c14..abaf5e8045 100644
--- a/features/FEATURE_LWIP/TESTS/mbedmicro-net/host_tests/tcp_echo_client.py
+++ b/features/FEATURE_LWIP/TESTS/mbedmicro-net/host_tests/tcp_echo_client.py
@@ -128,7 +128,7 @@ class TCPEchoClientTest(BaseHostTest):
         :return:
         """
         s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        s.connect((target_ip, 0)) # Target IP, Any port
+        s.connect((target_ip, 8000)) # Target IP, 'random' port
         ip = s.getsockname()[0]
         s.close()
         return ip
diff --git a/features/FEATURE_LWIP/TESTS/mbedmicro-net/host_tests/udp_echo_client.py b/features/FEATURE_LWIP/TESTS/mbedmicro-net/host_tests/udp_echo_client.py
index a2882c6aa2..f348b04230 100644
--- a/features/FEATURE_LWIP/TESTS/mbedmicro-net/host_tests/udp_echo_client.py
+++ b/features/FEATURE_LWIP/TESTS/mbedmicro-net/host_tests/udp_echo_client.py
@@ -55,7 +55,7 @@ class UDPEchoClientTest(BaseHostTest):
         :return:
         """
         s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        s.connect((target_ip, 0)) # Target IP, Any port
+        s.connect((target_ip, 8000)) # Target IP, 'random' port
         ip = s.getsockname()[0]
         s.close()
         return ip