diff --git a/qubes/device_protocol.py b/qubes/device_protocol.py
index 51d5ef1b1..e04340a77 100644
--- a/qubes/device_protocol.py
+++ b/qubes/device_protocol.py
@@ -560,10 +560,10 @@ def interfaces(self) -> List[DeviceInterface]:
     @property
     def parent_device(self) -> Optional[Device]:
         """
-        The parent device if any.
+        The parent device, if any.
 
-        If the device is part of another device (e.g. it's a single
-        partition of an usb stick), the parent device id should be here.
+        If the device is part of another device (e.g., it's a single
+        partition of a USB stick), the parent device id should be here.
         """
         return self._parent
 
@@ -572,7 +572,7 @@ def subdevices(self) -> List['DeviceInfo']:
         """
         The list of children devices if any.
 
-        If the device has subdevices (e.g. partitions of an usb stick),
+        If the device has subdevices (e.g., partitions of a USB stick),
         the subdevices id should be here.
         """
         return [dev for dev in self.backend_domain.devices[self.devclass]
@@ -604,7 +604,7 @@ def serialize(self) -> bytes:
 
         if self.attachment:
             properties = self.pack_property(
-                properties, 'attachment', self.attachment.name)
+                'attachment', self.attachment.name)
 
         properties += b' ' + self.pack_property(
             'interfaces',
@@ -742,6 +742,7 @@ def sanitize_str(
     if replace_char is None:
         not_allowed_chars = set(untrusted_value) - allowed_chars
         if not_allowed_chars:
+            print(untrusted_value)
             raise ProtocolError(error_message + repr(not_allowed_chars))
         return untrusted_value
     result = ""
diff --git a/qubes/tests/devices.py b/qubes/tests/devices.py
index f8d954ee6..b0bc4d4a8 100644
--- a/qubes/tests/devices.py
+++ b/qubes/tests/devices.py
@@ -491,7 +491,7 @@ def test_030_serialize_and_deserialize(self):
             serial=None,
             interfaces=[DeviceInterface(" 112233"),
                         DeviceInterface("&012345")],
-            **{"additional info": "and='more'", "date": "06.12.23"}
+            **{"additional_info": "and='more'", "date": "06.12.23"}
         )
         serialized = device.serialize()
         deserialized = DeviceInfo.deserialize(b'1-1.1.1 ' + serialized, self.vm)
diff --git a/qubes/tests/vm/qubesvm.py b/qubes/tests/vm/qubesvm.py
index e73f29968..3de6d48da 100644
--- a/qubes/tests/vm/qubesvm.py
+++ b/qubes/tests/vm/qubesvm.py
@@ -1312,7 +1312,7 @@ def test_600_libvirt_xml_hvm_pcidev(self):
             vm,  # this is violation of API, but for PCI the argument
             #  is unused
             '00_00.0',
-            bus='pci',
+            devclass='pci',
             persistent=True)
         vm.devices['pci']._set.add(
             assignment)