diff --git a/tests/hwsim/test_eap_proto.py b/tests/hwsim/test_eap_proto.py
index a1270ac3c..e12548171 100644
--- a/tests/hwsim/test_eap_proto.py
+++ b/tests/hwsim/test_eap_proto.py
@@ -160,7 +160,7 @@ def start_radius_server(eap_handler):
     srv.hosts["127.0.0.1"] = pyrad.server.RemoteHost("127.0.0.1",
                                                      b"radius",
                                                      "localhost")
-    srv.BindToAddress("")
+    srv.BindToAddress("127.0.0.1")
     t_stop = threading.Event()
     t = threading.Thread(target=run_pyrad_server, args=(srv, t_stop, eap_handler))
     t.start()
diff --git a/tests/hwsim/test_radius.py b/tests/hwsim/test_radius.py
index 5f1f4f175..224bff177 100644
--- a/tests/hwsim/test_radius.py
+++ b/tests/hwsim/test_radius.py
@@ -1132,7 +1132,7 @@ def test_radius_protocol(dev, apdev):
     srv.hosts["127.0.0.1"] = pyrad.server.RemoteHost("127.0.0.1",
                                                      b"radius",
                                                      "localhost")
-    srv.BindToAddress("")
+    srv.BindToAddress("127.0.0.1")
     t_events = {}
     t_events['stop'] = threading.Event()
     t_events['msg_auth'] = threading.Event()
@@ -1249,7 +1249,7 @@ def start_radius_psk_server(psk, invalid_code=False, acct_interim_interval=0,
     srv.hosts["127.0.0.1"] = pyrad.server.RemoteHost("127.0.0.1",
                                                      b"radius",
                                                      "localhost")
-    srv.BindToAddress("")
+    srv.BindToAddress("127.0.0.1")
     t_events = {}
     t_events['stop'] = threading.Event()
     t_events['psk'] = psk
@@ -1595,7 +1595,7 @@ def test_ap_vlan_wpa2_psk_radius_required(dev, apdev):
     srv.hosts["127.0.0.1"] = pyrad.server.RemoteHost("127.0.0.1",
                                                      b"radius",
                                                      "localhost")
-    srv.BindToAddress("")
+    srv.BindToAddress("127.0.0.1")
     t_events = {}
     t_events['stop'] = threading.Event()
     t_events['long'] = threading.Event()