diff --git a/plugins/RSS/test.py b/plugins/RSS/test.py
index adb25e87a..9012945ac 100644
--- a/plugins/RSS/test.py
+++ b/plugins/RSS/test.py
@@ -33,9 +33,9 @@ import feedparser
 from supybot.test import *
 import supybot.conf as conf
 if sys.version_info[0] >= 3:
-    from io import StringIO
+    from io import BytesIO
 else:
-    from cStringIO import StringIO
+    from cStringIO import StringIO as BytesIO
 
 xkcd_old = """<?xml version="1.0" encoding="utf-8"?>
 <rss version="2.0"><channel><title>xkcd.com</title><link>http://xkcd.com/</link><description>xkcd.com: A webcomic of romance and math humor.</description><language>en</language><item><title>Snake Facts</title><link>http://xkcd.com/1398/</link><description>&lt;img src="http://imgs.xkcd.com/comics/snake_facts.png" title="Biologically speaking, what we call a 'snake' is actually a human digestive tract which has escaped from its host." alt="Biologically speaking, what we call a 'snake' is actually a human digestive tract which has escaped from its host." /&gt;</description><pubDate>Wed, 23 Jul 2014 04:00:00 -0000</pubDate><guid>http://xkcd.com/1398/</guid></item></channel></rss>
@@ -45,9 +45,12 @@ xkcd_new = """<?xml version="1.0" encoding="utf-8"?>
 <rss version="2.0"><channel><title>xkcd.com</title><link>http://xkcd.com/</link><description>xkcd.com: A webcomic of romance and math humor.</description><language>en</language><item><title>Chaos</title><link>http://xkcd.com/1399/</link><description>&lt;img src="http://imgs.xkcd.com/comics/chaos.png" title="Although the oral exam for the doctorate was just 'can you do that weird laugh?'" alt="Although the oral exam for the doctorate was just 'can you do that weird laugh?'" /&gt;</description><pubDate>Fri, 25 Jul 2014 04:00:00 -0000</pubDate><guid>http://xkcd.com/1399/</guid></item><item><title>Snake Facts</title><link>http://xkcd.com/1398/</link><description>&lt;img src="http://imgs.xkcd.com/comics/snake_facts.png" title="Biologically speaking, what we call a 'snake' is actually a human digestive tract which has escaped from its host." alt="Biologically speaking, what we call a 'snake' is actually a human digestive tract which has escaped from its host." /&gt;</description><pubDate>Wed, 23 Jul 2014 04:00:00 -0000</pubDate><guid>http://xkcd.com/1398/</guid></item></channel></rss>
 """
 
+
 def constant(content):
+    if sys.version_info[0] >= 3:
+        content = content.encode()
     def f(*args, **kwargs):
-        return StringIO(content)
+        return BytesIO(content)
     return f
 
 url = 'http://www.advogato.org/rss/articles.xml'