diff --git a/psychopy_labhackers/components/millikey.py b/psychopy_labhackers/components/millikey.py
index 70cae81..07fc586 100644
--- a/psychopy_labhackers/components/millikey.py
+++ b/psychopy_labhackers/components/millikey.py
@@ -30,7 +30,7 @@ def getPorts():
                 "Serial port to connect to"
             )
         )
-        self.params['millikeyNButtons'] = Param(
+        params['millikeyNButtons'] = Param(
             8, valType="code", inputType="single", categ="Device",
             label=_translate("Num. buttons"),
             hint=_translate(