diff --git a/youtube_dl/extractor/blinkx.py b/youtube_dl/extractor/blinkx.py
index 7daeb90ad..96408e4e0 100644
--- a/youtube_dl/extractor/blinkx.py
+++ b/youtube_dl/extractor/blinkx.py
@@ -12,7 +12,7 @@ from ..utils import (
 
 class BlinkxIE(InfoExtractor):
     _VALID_URL = r'^(?:https?://(?:www\.)blinkx\.com/#?ce/|blinkx:)(?P<id>[^?]+)'
-    _IE_NAME = 'blinkx'
+    IE_NAME = 'blinkx'
 
     _TEST = {
         'url': 'http://www.blinkx.com/ce/8aQUy7GVFYgFzpKhT0oqsilwOGFRVXk3R1ZGWWdGenBLaFQwb3FzaWx3OGFRVXk3R1ZGWWdGenB',
diff --git a/youtube_dl/extractor/defense.py b/youtube_dl/extractor/defense.py
index 6069c4538..c5529f8d4 100644
--- a/youtube_dl/extractor/defense.py
+++ b/youtube_dl/extractor/defense.py
@@ -7,7 +7,7 @@ from .common import InfoExtractor
 
 
 class DefenseGouvFrIE(InfoExtractor):
-    _IE_NAME = 'defense.gouv.fr'
+    IE_NAME = 'defense.gouv.fr'
     _VALID_URL = (r'http://.*?\.defense\.gouv\.fr/layout/set/'
         r'ligthboxvideo/base-de-medias/webtv/(.*)')
 
diff --git a/youtube_dl/extractor/mpora.py b/youtube_dl/extractor/mpora.py
index b4cdd2a1e..0836243ea 100644
--- a/youtube_dl/extractor/mpora.py
+++ b/youtube_dl/extractor/mpora.py
@@ -11,7 +11,7 @@ from ..utils import (
 
 class MporaIE(InfoExtractor):
     _VALID_URL = r'^https?://(www\.)?mpora\.(?:com|de)/videos/(?P<id>[^?#/]+)'
-    _IE_NAME = 'MPORA'
+    IE_NAME = 'MPORA'
 
     _TEST = {
         'url': 'http://mpora.de/videos/AAdo8okx4wiz/embed?locale=de',