diff --git a/src/calibre/ebooks/oeb/transforms/jacket.py b/src/calibre/ebooks/oeb/transforms/jacket.py
index a29af2d7e9..3c6ba2621f 100644
--- a/src/calibre/ebooks/oeb/transforms/jacket.py
+++ b/src/calibre/ebooks/oeb/transforms/jacket.py
@@ -15,7 +15,7 @@ from lxml import etree
 from calibre import guess_type, strftime
 from calibre.constants import iswindows
 from calibre.ebooks.BeautifulSoup import BeautifulSoup
-from calibre.ebooks.oeb.base import XPath, XHTML_NS, XHTML, xml2text, urldefrag
+from calibre.ebooks.oeb.base import XPath, XHTML_NS, XHTML, xml2text, urldefrag, urlnormalize
 from calibre.library.comments import comments_to_html
 from calibre.utils.date import is_date_undefined, as_local_time
 from calibre.utils.icu import sort_key
@@ -43,7 +43,10 @@ class Base(object):
             if removed >= limit:
                 break
             href  = item.abshref(img.get('src'))
-            image = self.oeb.manifest.hrefs.get(href, None)
+            image = self.oeb.manifest.hrefs.get(href)
+            if image is None:
+                href = urlnormalize(href)
+                image = self.oeb.manifest.hrefs.get(href)
             if image is not None:
                 self.oeb.manifest.remove(image)
                 self.oeb.guide.remove_by_href(href)