diff --git a/pypdf/generic.py b/pypdf/generic.py
index 5e5555da3..3f269b545 100644
--- a/pypdf/generic.py
+++ b/pypdf/generic.py
@@ -734,7 +734,7 @@ def readFromStream(stream, pdf):
 
 class TreeObject(DictionaryObject):
     def __init__(self):
-        DictionaryObject.__init__()
+        DictionaryObject.__init__(self)
 
     def hasChildren(self):
         return '/First' in self