diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -503,7 +503,7 @@
         self._postdsstatus = []
 
         # Cache of types representing filtered repos.
-        self._filteredrepotypes = weakref.WeakKeyDictionary()
+        self._filteredrepotypes = weakref.WeakValueDictionary()
 
         # generic mapping between names and nodes
         self.names = namespaces.namespaces()
@@ -685,12 +685,13 @@
         # created types so this method doesn't leak on every
         # invocation.
 
-        key = self.unfiltered().__class__
+        unfibase = self.unfiltered().__class__
+        key = str(self.unfiltered().__class__) + name
         if key not in self._filteredrepotypes:
             # Build a new type with the repoview mixin and the base
             # class of this repo. Give it a name containing the
             # filter name to aid debugging.
-            bases = (repoview.repoview, key)
+            bases = (repoview.repoview, unfibase)
             cls = type(r'%sfilteredrepo' % name, bases, {})
             self._filteredrepotypes[key] = cls