diff --git a/tests/hwsim/test_eap_proto.py b/tests/hwsim/test_eap_proto.py
index 7aeaf968c..fad33bba5 100644
--- a/tests/hwsim/test_eap_proto.py
+++ b/tests/hwsim/test_eap_proto.py
@@ -145,6 +145,9 @@ def start_radius_server(eap_handler):
                     else:
                         logger.error("Unexpected event in pyrad server main loop")
 
+            for fd in self.authfds + self.acctfds:
+                fd.close()
+
     srv = TestServer(dict=pyrad.dictionary.Dictionary("dictionary.radius"),
                      authport=18138, acctport=18139)
     srv.hosts["127.0.0.1"] = pyrad.server.RemoteHost("127.0.0.1",
diff --git a/tests/hwsim/test_radius.py b/tests/hwsim/test_radius.py
index 6e825f0f5..dbefaf551 100644
--- a/tests/hwsim/test_radius.py
+++ b/tests/hwsim/test_radius.py
@@ -1079,6 +1079,9 @@ def test_radius_protocol(dev, apdev):
                     else:
                         logger.error("Unexpected event in pyrad server main loop")
 
+            for fd in self.authfds + self.acctfds:
+                fd.close()
+
     srv = TestServer(dict=pyrad.dictionary.Dictionary("dictionary.radius"),
                      authport=18138, acctport=18139)
     srv.hosts["127.0.0.1"] = pyrad.server.RemoteHost("127.0.0.1",
@@ -1193,6 +1196,9 @@ def start_radius_psk_server(psk, invalid_code=False, acct_interim_interval=0,
                     else:
                         logger.error("Unexpected event in pyrad server main loop")
 
+            for fd in self.authfds + self.acctfds:
+                fd.close()
+
     srv = TestServer(dict=pyrad.dictionary.Dictionary("dictionary.radius"),
                      authport=18138, acctport=18139)
     srv.hosts["127.0.0.1"] = pyrad.server.RemoteHost("127.0.0.1",
@@ -1471,6 +1477,9 @@ def test_ap_vlan_wpa2_psk_radius_required(dev, apdev):
                     else:
                         logger.error("Unexpected event in pyrad server main loop")
 
+            for fd in self.authfds + self.acctfds:
+                fd.close()
+
     srv = TestServer(dict=pyrad.dictionary.Dictionary("dictionary.radius"),
                      authport=18138, acctport=18139)
     srv.hosts["127.0.0.1"] = pyrad.server.RemoteHost("127.0.0.1",