diff --git a/onnxscript/rewriter/pattern.py b/onnxscript/rewriter/pattern.py
index d58cb7201..87544874d 100644
--- a/onnxscript/rewriter/pattern.py
+++ b/onnxscript/rewriter/pattern.py
@@ -559,11 +559,11 @@ def clone(self, node_map: dict[NodePattern, NodePattern], swap: bool) -> NodePat
             ), "Internal error: commutative swap applies only to binary ops."
             inputs = [inputs[1], inputs[0]]
         outputs = [value.name for value in self.outputs]
-        copy = NodePattern(
+        copied = NodePattern(
             self.domain, self.op, inputs, self.attributes, outputs, self.allow_other_attributes
         )
-        node_map[self] = copy
-        return copy
+        node_map[self] = copied
+        return copied
 
 
 class NodeOutputPattern(ValuePattern):