diff --git a/src/calibre/ebooks/oeb/stylizer.py b/src/calibre/ebooks/oeb/stylizer.py
index 5adb1544eb..64ed2a45e8 100644
--- a/src/calibre/ebooks/oeb/stylizer.py
+++ b/src/calibre/ebooks/oeb/stylizer.py
@@ -17,6 +17,7 @@ from xml.dom import SyntaxErr as CSSSyntaxError
 import cssutils
 from cssutils.css import CSSStyleRule, CSSPageRule, CSSStyleDeclaration, \
     CSSValueList, cssproperties
+from cssutils.profiles import profiles as cssprofiles
 from lxml import etree
 from lxml.cssselect import css_to_xpath, ExpressionError
 from calibre.ebooks.oeb.base import XHTML, XHTML_NS, CSS_MIME, OEB_STYLES
@@ -241,7 +242,7 @@ class Stylizer(object):
             primitives.reverse()
             value = primitives.pop()
             for key in composition:
-                if cssproperties.cssvalues[key](value):
+                if cssprofiles.validate(key, value):
                     style[key] = value
                     if not primitives: break
                     value = primitives.pop()