diff --git a/src/veles/device/find.py b/src/veles/device/find.py
index 310cf1e..fe2f48d 100644
--- a/src/veles/device/find.py
+++ b/src/veles/device/find.py
@@ -1,5 +1,5 @@
 from typing import Final, Dict, Any, TypeVar, Type, Iterable
-from .generic import Device
+from .generic import Device, NoResponseError
 from .sensor_wired import SensorWiredIAQ, SensorWiredRHT
 
 # links device identifiers to its class
diff --git a/src/veles/device/generic.py b/src/veles/device/generic.py
index 513187a..9beaa8e 100644
--- a/src/veles/device/generic.py
+++ b/src/veles/device/generic.py
@@ -3,10 +3,7 @@ from dataclasses import dataclass
 from typing import Dict, Any
 from abc import ABC, abstractmethod
 
-import sys
-py310 = sys.version_info.minor >= 10 or sys.version_info.major > 3
-
-@dataclass(**({"slots": True} if py310 else {}))
+@dataclass(slots=True)
 class ReadoutErrorCounter:
     """Class used to track readout errors"""