diff --git a/src/ophyd_async/tango/device_controllers/sis3820.py b/src/ophyd_async/tango/device_controllers/sis3820.py
index 7920d555dd..3c11eb3b67 100644
--- a/src/ophyd_async/tango/device_controllers/sis3820.py
+++ b/src/ophyd_async/tango/device_controllers/sis3820.py
@@ -2,15 +2,14 @@
 
 from typing import Dict
 
-# from bluesky.protocols import Triggerable
-from bluesky.protocols import Reading
+from bluesky.protocols import Reading, Triggerable
 
 from ophyd_async.core import AsyncStatus
 from ophyd_async.tango import TangoReadableDevice, tango_signal_rw, tango_signal_x
 
 
 # --------------------------------------------------------------------
-class SIS3820Counter(TangoReadableDevice):  # Triggerable
+class SIS3820Counter(TangoReadableDevice, Triggerable):
     src_dict: dict = {
         "counts": "/counts",
         "offset": "/offset",