diff --git a/src/calibre/utils/cleantext.py b/src/calibre/utils/cleantext.py
index 938960df93..f421fdcba2 100644
--- a/src/calibre/utils/cleantext.py
+++ b/src/calibre/utils/cleantext.py
@@ -8,11 +8,13 @@ import re, htmlentitydefs
 _ascii_pat = None
 
 def clean_ascii_chars(txt, charlist=None):
-    'remove ASCII invalid chars : 0 to 8 and 11-14 to 24-26-27 by default'
+    '''
+    Remove ASCII control chars: 0 to 8 and 11, 12, 14-31 by default
+    This is all control chars except \\t,\\n and \\r
+    '''
     global _ascii_pat
     if _ascii_pat is None:
-        chars = list(range(8)) + [0x0B, 0x0E, 0x0F] + list(range(0x10, 0x19)) \
-            + [0x1A, 0x1B]
+        chars = list(range(8)) + [0x0B, 0x0C] + list(range(0x0E, 0x1F))
         _ascii_pat = re.compile(u'|'.join(map(unichr, chars)))
 
     if charlist is None:
diff --git a/src/calibre/web/feeds/__init__.py b/src/calibre/web/feeds/__init__.py
index 478dd5015b..cddb776b4c 100644
--- a/src/calibre/web/feeds/__init__.py
+++ b/src/calibre/web/feeds/__init__.py
@@ -13,6 +13,7 @@ from calibre.web.feeds.feedparser import parse
 from calibre.utils.logging import default_log
 from calibre import entity_to_unicode, strftime
 from calibre.utils.date import dt_factory, utcnow, local_tz
+from calibre.utils.cleantext import clean_ascii_chars
 
 class Article(object):
 
@@ -43,7 +44,7 @@ class Article(object):
                 print summary.encode('utf-8')
                 traceback.print_exc()
                 summary = u''
-        self.text_summary = summary
+        self.text_summary = clean_ascii_chars(summary)
         self.author = author
         self.content = content
         self.date = published