diff --git a/hgext/mq.py b/hgext/mq.py
--- a/hgext/mq.py
+++ b/hgext/mq.py
@@ -3511,9 +3511,9 @@ def reposetup(ui, repo):
 
         def invalidateall(self):
             super(mqrepo, self).invalidateall()
-            if localrepo.hasunfilteredcache(self, 'mq'):
+            if localrepo.hasunfilteredcache(self, r'mq'):
                 # recreate mq in case queue path was changed
-                delattr(self.unfiltered(), 'mq')
+                delattr(self.unfiltered(), r'mq')
 
         def abortifwdirpatched(self, errmsg, force=False):
             if self.mq.applied and self.mq.checkapplied and not force:
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -2047,9 +2047,9 @@ class localrepository(object):
 
     def invalidatecaches(self):
 
-        if '_tagscache' in vars(self):
+        if r'_tagscache' in vars(self):
             # can't use delattr on proxy
-            del self.__dict__['_tagscache']
+            del self.__dict__[r'_tagscache']
 
         self.unfiltered()._branchcaches.clear()
         self.invalidatevolatilesets()