diff --git a/qubesusbproxy/core3ext.py b/qubesusbproxy/core3ext.py
index 01aa910..9aea5f3 100644
--- a/qubesusbproxy/core3ext.py
+++ b/qubesusbproxy/core3ext.py
@@ -609,8 +609,8 @@ async def on_device_detach_usb(self, vm, event, device):
     async def on_domain_start(self, vm, _event, **_kwargs):
         # pylint: disable=unused-argument
         for assignment in vm.devices['usb'].get_assigned_devices():
-            asyncio.ensure_future(self.attach_and_notify(
-                vm, assignment.device, assignment.options))
+            await self.attach_and_notify(
+                vm, assignment.device, assignment.options)
 
     @qubes.ext.handler('domain-shutdown')
     async def on_domain_shutdown(self, vm, _event, **_kwargs):
diff --git a/qubesusbproxy/tests.py b/qubesusbproxy/tests.py
index a268219..30b1d98 100644
--- a/qubesusbproxy/tests.py
+++ b/qubesusbproxy/tests.py
@@ -395,7 +395,7 @@ def test_010_assign(self):
                                            wait=True), 0,
                          "Device connection failed")
 
-        self.assertEquals(usb_dev.attachment,
+        self.assertEqual(usb_dev.attachment,
                           self.frontend)
 
     def test_020_attach(self):