diff --git a/electrum/contacts.py b/electrum/contacts.py
index 2c1dfb6af..0fff1c3cc 100644
--- a/electrum/contacts.py
+++ b/electrum/contacts.py
@@ -103,7 +103,7 @@ class Contacts(dict, Logger):
                 self.alias_info = self.resolve_openalias(alias)
                 trigger_callback('alias_received')
             t = threading.Thread(target=f)
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
 
     def resolve_openalias(self, url):
diff --git a/electrum/plugins/keepkey/keepkey.py b/electrum/plugins/keepkey/keepkey.py
index 8a76c2d45..4a3141793 100644
--- a/electrum/plugins/keepkey/keepkey.py
+++ b/electrum/plugins/keepkey/keepkey.py
@@ -222,7 +222,7 @@ class KeepKeyPlugin(HW_PluginBase):
             import threading
             settings = self.request_trezor_init_settings(wizard, method, self.device)
             t = threading.Thread(target=self._initialize_device_safe, args=(settings, method, device_id, wizard, handler))
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
             exit_code = wizard.loop.exec_()
             if exit_code != 0:
diff --git a/electrum/plugins/safe_t/safe_t.py b/electrum/plugins/safe_t/safe_t.py
index 829c9fea6..e52c55d59 100644
--- a/electrum/plugins/safe_t/safe_t.py
+++ b/electrum/plugins/safe_t/safe_t.py
@@ -180,7 +180,7 @@ class SafeTPlugin(HW_PluginBase):
             import threading
             settings = self.request_safe_t_init_settings(wizard, method, self.device)
             t = threading.Thread(target=self._initialize_device_safe, args=(settings, method, device_id, wizard, handler))
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
             exit_code = wizard.loop.exec_()
             if exit_code != 0:
diff --git a/electrum/plugins/trezor/trezor.py b/electrum/plugins/trezor/trezor.py
index c5e258a51..9a8b483b2 100644
--- a/electrum/plugins/trezor/trezor.py
+++ b/electrum/plugins/trezor/trezor.py
@@ -222,7 +222,7 @@ class TrezorPlugin(HW_PluginBase):
             import threading
             settings = self.request_trezor_init_settings(wizard, method, device_id)
             t = threading.Thread(target=self._initialize_device_safe, args=(settings, method, device_id, wizard, handler))
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
             exit_code = wizard.loop.exec_()
             if exit_code != 0:
diff --git a/electrum/plugins/trustedcoin/qt.py b/electrum/plugins/trustedcoin/qt.py
index 0c0a61281..f443bb526 100644
--- a/electrum/plugins/trustedcoin/qt.py
+++ b/electrum/plugins/trustedcoin/qt.py
@@ -278,7 +278,7 @@ class Plugin(TrustedCoinPlugin):
         tos_e.tos_signal.connect(on_result)
         tos_e.error_signal.connect(on_error)
         t = threading.Thread(target=request_TOS)
-        t.setDaemon(True)
+        t.daemon = True
         t.start()
         email_e.textChanged.connect(set_enabled)
         email_e.setFocus(True)
diff --git a/electrum/plugins/trustedcoin/trustedcoin.py b/electrum/plugins/trustedcoin/trustedcoin.py
index 40c8c9096..f5dfdb343 100644
--- a/electrum/plugins/trustedcoin/trustedcoin.py
+++ b/electrum/plugins/trustedcoin/trustedcoin.py
@@ -523,7 +523,7 @@ class TrustedCoinPlugin(BasePlugin):
         if self.requesting is False:
             self.requesting = True
             t = Thread(target=self.request_billing_info, args=(wallet,))
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
             return t