diff --git a/.mypy.ini b/.mypy.ini
index 59a3f8670..e315f0b13 100644
--- a/.mypy.ini
+++ b/.mypy.ini
@@ -20,6 +20,7 @@ strict_equality = True
 warn_unreachable = True
 disallow_any_unimported = True
 enable_error_code = ignore-without-code
+strict_bytes = True
 
 ### Output
 show_error_context = True
diff --git a/qutebrowser/misc/nativeeventfilter.py b/qutebrowser/misc/nativeeventfilter.py
index 2b2d3f635..1933dc63f 100644
--- a/qutebrowser/misc/nativeeventfilter.py
+++ b/qutebrowser/misc/nativeeventfilter.py
@@ -137,7 +137,9 @@ class NativeEventFilter(QAbstractNativeEventFilter):
             xcb.xcb_disconnect(conn)
 
     def nativeEventFilter(
-        self, evtype: Union[bytes, QByteArray], message: Optional[sip.voidptr]
+        self,
+        evtype: Union[QByteArray, bytes, bytearray, memoryview],
+        message: Optional[sip.voidptr],
     ) -> tuple[bool, _PointerRetType]:
         """Handle XCB events."""
         # We're only installed when the platform plugin is xcb