diff --git a/mpv.py b/mpv.py
index 880146f..08e9cdd 100644
--- a/mpv.py
+++ b/mpv.py
@@ -506,11 +506,11 @@ class MPV(object):
 
     @property
     def video_params(self):
-        return self._get_dict('video-params/', _VIDEO_PARAMS_LIST)
+        return self._get_dict('video-params/', self._VIDEO_PARAMS_LIST)
 
     @property
     def video_out_params(self):
-        return self._get_dict('video-out-params/', _VIDEO_PARAMS_LIST)
+        return self._get_dict('video-out-params/', self._VIDEO_PARAMS_LIST)
 
     @property
     def playlist(self):