diff --git a/volatility3/framework/symbols/linux/extensions/__init__.py b/volatility3/framework/symbols/linux/extensions/__init__.py
index d8a2867cc..d73d0cfb9 100644
--- a/volatility3/framework/symbols/linux/extensions/__init__.py
+++ b/volatility3/framework/symbols/linux/extensions/__init__.py
@@ -362,7 +362,7 @@ class maple_tree(objects.StructType):
         # None. If however you wanted to parse from a node, but ignore some parts of the tree below it then
         # this could be populated with the addresses of the nodes you wish to ignore.
 
-        if seen == None:
+        if seen is None:
             seen = set()
 
         # protect against unlikely loop