diff --git a/src/calibre/library/comments.py b/src/calibre/library/comments.py
index ba4e8a581e..661fe829de 100644
--- a/src/calibre/library/comments.py
+++ b/src/calibre/library/comments.py
@@ -165,7 +165,11 @@ def find_tests():
                     ('a <?xml asd> b\n\ncd',
                         '<p class="description">a  b</p><p class="description">cd</p>'),
             ]:
-                cval = comments_to_html(pat)
-                self.assertEqual(cval, val)
+                try:
+                    cval = comments_to_html(pat)
+                except DeprecationWarning:
+                    pass  # new lxml + old Beautiful soup == deprecation warning
+                else:
+                    self.assertEqual(cval, val)
 
     return unittest.defaultTestLoader.loadTestsFromTestCase(Test)