diff --git a/youtube_dl/extractor/deezer.py b/youtube_dl/extractor/deezer.py
index c5c7d6472..7409551d1 100644
--- a/youtube_dl/extractor/deezer.py
+++ b/youtube_dl/extractor/deezer.py
@@ -13,7 +13,7 @@ from ..utils import (
 class DeezerBaseInfoExtractor(InfoExtractor):
 
     def get_data(self, url):
-        if 'test' not in self._downloader.params:
+        if not self._downloader.params.get('test'):
             self._downloader.report_warning('For now, this extractor only supports the 30 second previews. Patches welcome!')
 
         mobj = re.match(self._VALID_URL, url)