diff --git a/src/calibre/ebooks/docx/writer/images.py b/src/calibre/ebooks/docx/writer/images.py
index bf5c293a1f..54b62d611f 100644
--- a/src/calibre/ebooks/docx/writer/images.py
+++ b/src/calibre/ebooks/docx/writer/images.py
@@ -14,7 +14,7 @@ from polyglot.builtins import iteritems, itervalues, map, unicode_type
 from lxml import etree
 
 from calibre import fit_image
-from calibre.ebooks.oeb.base import urlunquote
+from calibre.ebooks.oeb.base import urlunquote, urlquote
 from calibre.ebooks.docx.images import pt_to_emu
 from calibre.utils.filenames import ascii_filename
 from calibre.utils.imghdr import identify
@@ -50,8 +50,9 @@ class ImagesManager(object):
 
     def read_image(self, href):
         if href not in self.images:
-            item = self.oeb.manifest.hrefs.get(href)
+            item = self.oeb.manifest.hrefs.get(href) or self.oeb.manifest.hrefs.get(urlquote(href))
             if item is None or not isinstance(item.data, bytes):
+                self.log.warning('Failed to find image:', href)
                 return
             try:
                 fmt, width, height = identify(item.data)