diff --git a/src/calibre/ebooks/oeb/base.py b/src/calibre/ebooks/oeb/base.py
index c8e66b70bb..c57dfc3706 100644
--- a/src/calibre/ebooks/oeb/base.py
+++ b/src/calibre/ebooks/oeb/base.py
@@ -1806,7 +1806,7 @@ class OEBBook(object):
         return {OPF_MIME: ('content.opf', package)}
 
     def _update_playorder(self, ncx):
-        hrefs = set(xpath(ncx, '//ncx:content/@src'))
+        hrefs = set(map(urlnormalize, xpath(ncx, '//ncx:content/@src')))
         playorder = {}
         next = 1
         selector = XPath('h:body//*[@id or @name]')
@@ -1828,9 +1828,9 @@ class OEBBook(object):
                 if added:
                     next += 1
         selector = XPath('ncx:content/@src')
-        for elem in xpath(ncx, '//*[@playOrder and ./ncx:content[@src]]'):
-            href = selector(elem)[0]
-            order = playorder.get(href, 0)
+        for i, elem in enumerate(xpath(ncx, '//*[@playOrder and ./ncx:content[@src]]')):
+            href = urlnormalize(selector(elem)[0])
+            order = playorder.get(href, i)
             elem.attrib['playOrder'] = str(order)
         return
 
diff --git a/src/calibre/manual/faq.rst b/src/calibre/manual/faq.rst
index 9e0b2a85de..18feb2a519 100644
--- a/src/calibre/manual/faq.rst
+++ b/src/calibre/manual/faq.rst
@@ -86,7 +86,7 @@ At the moment |app| has full support for the SONY PRS 300/500/505/600/700/900, B
 How can I help get my device supported in |app|?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-If your device appears as a USB disk to the operating system. Adding support for it to |app| is very easy.
+If your device appears as a USB disk to the operating system, adding support for it to |app| is very easy.
 We just need some information from you:
 
   * What e-book formats does your device support?