diff --git a/flask_nav/__init__.py b/flask_nav/__init__.py
index 7c25dfa..9fea6ee 100644
--- a/flask_nav/__init__.py
+++ b/flask_nav/__init__.py
@@ -46,7 +46,7 @@ class NavbarRenderingError(Exception):
     pass
 
 
-class ElementRegistry(collections.MutableMapping):
+class ElementRegistry(collections.abc.MutableMapping):
     def __init__(self):
         self._elems = {}