diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index c1bd0b085..1db27315c 100644
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -1236,6 +1236,3 @@ def _setup_opener(self):
         # (See https://github.com/rg3/youtube-dl/issues/1309 for details)
         opener.addheaders = []
         self._opener = opener
-
-        # TODO remove this global modification
-        compat_urllib_request.install_opener(opener)