diff --git a/modules/attilasub/backend.py b/modules/attilasub/backend.py
index bfe0446e..25ada04d 100644
--- a/modules/attilasub/backend.py
+++ b/modules/attilasub/backend.py
@@ -17,7 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
-from weboob.capabilities.subtitle import ICapSubtitle
+from weboob.capabilities.subtitle import ICapSubtitle,LanguageNotSupported
 from weboob.tools.backend import BaseBackend
 
 from .browser import AttilasubBrowser
@@ -52,5 +52,5 @@ class AttilasubBackend(BaseBackend, ICapSubtitle):
 
     def iter_subtitles(self, language, pattern):
         if language not in self.LANGUAGE_LIST:
-            return []
+            raise LanguageNotSupported()
         return self.browser.iter_subtitles(language,quote_plus(pattern.encode('utf-8')))
diff --git a/modules/opensubtitles/backend.py b/modules/opensubtitles/backend.py
index e1b8acac..96313f15 100644
--- a/modules/opensubtitles/backend.py
+++ b/modules/opensubtitles/backend.py
@@ -17,7 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
-from weboob.capabilities.subtitle import ICapSubtitle
+from weboob.capabilities.subtitle import ICapSubtitle,LanguageNotSupported
 from weboob.tools.backend import BaseBackend
 
 from .browser import OpensubtitlesBrowser,LANGUAGE_CONV
@@ -51,5 +51,5 @@ class OpensubtitlesBackend(BaseBackend, ICapSubtitle):
 
     def iter_subtitles(self, language, pattern):
         if language not in LANGUAGE_CONV.keys():
-            return []
+            raise LanguageNotSupported()
         return self.browser.iter_subtitles(language,quote_plus(pattern.encode('utf-8')))
diff --git a/modules/tvsubtitles/backend.py b/modules/tvsubtitles/backend.py
index 5fb9508a..dbfb694b 100644
--- a/modules/tvsubtitles/backend.py
+++ b/modules/tvsubtitles/backend.py
@@ -17,10 +17,10 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
-from weboob.capabilities.subtitle import ICapSubtitle
+from weboob.capabilities.subtitle import ICapSubtitle,LanguageNotSupported
 from weboob.tools.backend import BaseBackend
 
-from .browser import TvsubtitlesBrowser,LANGUAGE_CONV
+from .browser import TvsubtitlesBrowser,LANGUAGE_LIST
 
 from urllib import quote_plus
 
@@ -50,6 +50,6 @@ class TvsubtitlesBackend(BaseBackend, ICapSubtitle):
         return self.browser.openurl(subtitle.url.encode('utf-8')).read()
 
     def iter_subtitles(self, language, pattern):
-        if language not in LANGUAGE_CONV.keys():
-            return []
+        if language not in LANGUAGE_LIST:
+            raise LanguageNotSupported()
         return self.browser.iter_subtitles(language,quote_plus(pattern.encode('utf-8')))
diff --git a/modules/tvsubtitles/browser.py b/modules/tvsubtitles/browser.py
index 4aad8b2a..fb7eefde 100644
--- a/modules/tvsubtitles/browser.py
+++ b/modules/tvsubtitles/browser.py
@@ -25,23 +25,9 @@ from .pages import SeriePage, SearchPage, SeasonPage,HomePage
 
 __all__ = ['OpensubtitlesBrowser']
 
-LANGUAGE_CONV = {
-'ar':'ara', 'eo':'epo',  'ga':'',    'ru':'rus',
-'af':''   , 'et':'est',  'it':'ita', 'sr':'scc',
-'sq':'alb', 'tl':''   ,  'ja':'jpn', 'sk':'slo',
-'hy':'arm', 'fi':'fin',  'kn':'',    'sl':'slv',
-'az':''   , 'fr':'fre',  'ko':'kor', 'es':'spa',
-'eu':'baq', 'gl':'glg',  'la':'',    'sw':'swa',
-'be':''   , 'ka':'geo',  'lv':'lav', 'sv':'swe',
-'bn':'ben', 'de':'ger',  'lt':'lit', 'ta':'',
-'bg':'bul', 'gr':'ell',  'mk':'mac', 'te':'tel',
-'ca':'cat', 'gu':''   ,  'ms':'may', 'th':'tha',
-'zh':'chi', 'ht':''   ,  'mt':'',    'tr':'tur',
-'hr':'hrv', 'iw':'heb',  'no':'nor', 'uk':'ukr',
-'cz':'cze', 'hi':'hin',  'fa':'per', 'ur':'urd',
-'da':'dan', 'hu':'hun',  'pl':'pol', 'vi':'vie',
-'nl':'dut', 'is':'ice',  'pt':'por', 'cy':'',
-'en':'eng', 'id':'ind',  'ro':'rum', 'yi':''}
+LANGUAGE_LIST = ['en','es','fr','de','br','ru','ua','it','gr',
+                 'ar','hu','pl','tr','nl','pt','sv','da','fi',
+                 'ko','cn','jp','bg','cz','ro']
 
 class TvsubtitlesBrowser(BaseBrowser):
     DOMAIN = 'www.tvsubtitles.net'
diff --git a/weboob/capabilities/subtitle.py b/weboob/capabilities/subtitle.py
index db0b2c2e..87d0447d 100644
--- a/weboob/capabilities/subtitle.py
+++ b/weboob/capabilities/subtitle.py
@@ -25,6 +25,15 @@ from .base import IBaseCap, CapBaseObject, Field, StringField, FloatField, \
 __all__ = ['Subtitle', 'ICapSubtitle']
 
 
+class LanguageNotSupported(UserError):
+    """
+    Raised when the language is not supported
+    """
+
+    def __init__(self, msg='language is not supported'):
+        UserError.__init__(self, msg)
+
+
 class Subtitle(CapBaseObject):
     """
     Subtitle object.