--- a/mercurial/changelog.py	Thu Feb 28 07:45:51 2019 -0800
+++ b/mercurial/changelog.py	Sat Mar 02 12:51:04 2019 -0800
@@ -183,8 +183,8 @@
     """
 
     __slots__ = (
-        u'_offsets',
-        u'_text',
+        r'_offsets',
+        r'_text',
     )
 
     def __new__(cls, text):