diff --git a/plover_platform_specific_translation/extension.py b/plover_platform_specific_translation/extension.py
index 35ddc8e..635e53d 100644
--- a/plover_platform_specific_translation/extension.py
+++ b/plover_platform_specific_translation/extension.py
@@ -90,7 +90,7 @@ def _platform_specific_translation(
             )
             config.save(_CONFIG_FILEPATH, self._platform_translations)
 
-        action = ctx.new_action()
+        action: _Action = ctx.new_action()
 
         if platform_translation_type == translation.COMBO:
             action.combo = platform_translation