diff --git a/src/calibre/ebooks/oeb/stylizer.py b/src/calibre/ebooks/oeb/stylizer.py
index a85df4d744..be96a8dd03 100644
--- a/src/calibre/ebooks/oeb/stylizer.py
+++ b/src/calibre/ebooks/oeb/stylizer.py
@@ -347,7 +347,11 @@ class Stylizer(object):
             style = self.flatten_style(rule.style)
             self.page_rule.update(style)
         elif isinstance(rule, CSSFontFaceRule):
-            self.font_face_rules.append(rule)
+            if rule.style.length > 1:
+                # Ignore the meaningless font face rules generated by the
+                # benighted MS Word that contain only a font-family declaration
+                # and nothing else
+                self.font_face_rules.append(rule)
         return results
 
     def flatten_style(self, cssstyle):