diff --git a/tests/multi_net/ssl_data.py b/tests/multi_net/ssl_data.py
index cf2f96e0f3..e5196c81ba 100644
--- a/tests/multi_net/ssl_data.py
+++ b/tests/multi_net/ssl_data.py
@@ -47,6 +47,7 @@ def instance0():
     s2 = ssl.wrap_socket(s2, server_side=True, key=key, cert=cert)
     print(s2.read(16))
     s2.write(b"server to client")
+    s2.close()
     s.close()
 
 
diff --git a/tests/multi_net/tcp_client_rst.py b/tests/multi_net/tcp_client_rst.py
index 14da8b1470..1fe994f36c 100644
--- a/tests/multi_net/tcp_client_rst.py
+++ b/tests/multi_net/tcp_client_rst.py
@@ -38,6 +38,7 @@ def instance0():
     # TODO lwip raises here but apparently it shouldn't
     print(s2.recv(10))
     print(convert_poll_list(poll.poll(1000)))
+    s2.close()
     s.close()
 
 
diff --git a/tests/multi_net/tcp_data.py b/tests/multi_net/tcp_data.py
index 61224efd2c..bba2d198c4 100644
--- a/tests/multi_net/tcp_data.py
+++ b/tests/multi_net/tcp_data.py
@@ -15,6 +15,7 @@ def instance0():
     s2, _ = s.accept()
     print(s2.recv(16))
     s2.send(b"server to client")
+    s2.close()
     s.close()