--- a/Helpviewer/AdBlock/AdBlockRule.py	Sun Dec 18 13:42:41 2016 +0100
+++ b/Helpviewer/AdBlock/AdBlockRule.py	Sun Dec 18 18:46:43 2016 +0100
@@ -365,7 +365,8 @@
         @param req request object to check (QNetworkRequest)
         @return flag indicating a match (boolean)
         """
-        referer = bytes(req.attribute(QNetworkRequest.User + 200, "")).decode()
+        referer = \
+            bytes(req.attribute(QNetworkRequest.User + 200, b"")).decode()
         if referer == "":
             return False