diff --git a/weboob/backends/youporn/video.py b/weboob/backends/youporn/video.py
index 7f5b588d..70250d18 100644
--- a/weboob/backends/youporn/video.py
+++ b/weboob/backends/youporn/video.py
@@ -29,4 +29,7 @@ class YoupornVideo(BaseVideo):
 
     @classmethod
     def id2url(cls, _id):
-        return 'http://www.youporn.com/watch/%d' % int(_id)
+        if _id.isdigit():
+            return 'http://www.youporn.com/watch/%d' % int(_id)
+        else:
+            return None