diff --git a/src/calibre/ebooks/oeb/stylizer.py b/src/calibre/ebooks/oeb/stylizer.py
index ec3f4e87ba..ad6846c456 100644
--- a/src/calibre/ebooks/oeb/stylizer.py
+++ b/src/calibre/ebooks/oeb/stylizer.py
@@ -275,7 +275,7 @@ class Stylizer(object):
         rules.sort()
         self.rules = rules
         self._styles = {}
-        pseudo_pat = re.compile(ur':(first-letter|first-line|link|hover|visited|active|focus|before|after)', re.I)
+        pseudo_pat = re.compile(ur':{1,2}(first-letter|first-line|link|hover|visited|active|focus|before|after)', re.I)
         for _, _, cssdict, text, _ in rules:
             fl = pseudo_pat.search(text)
             if fl is not None: