1 files changed, 1 insertions, 1 deletions
diff --git a/nodes.py b/nodes.py
index 500f3890..6445b556 100644
--- a/nodes.py
+++ b/nodes.py
@@ -338,7 +338,7 @@ class NodeNG:
 # extend all classes instead of base Node class which is an unextendable type
 # in 2.6
 for cls in ALL_NODES:
-    extend_class(cls, NodeNG)
+    extend_class(cls, [NodeNG])
 
 INDENT = "    "