diff --git a/onnxruntime/python/tools/quantization/matmul_4bits_quantizer.py b/onnxruntime/python/tools/quantization/matmul_4bits_quantizer.py
index f4bcd508960a1..3090296b774aa 100644
--- a/onnxruntime/python/tools/quantization/matmul_4bits_quantizer.py
+++ b/onnxruntime/python/tools/quantization/matmul_4bits_quantizer.py
@@ -440,7 +440,7 @@ def quantize(self, node: NodeProto, graph_stack: list[GraphProto]) -> NodeProto:
         kwargs["bits"] = 4
         kwargs["block_size"] = self.config.block_size
         if self.config.accuracy_level is not None:
-            kwargs["accuracy_level"] = self.accuracy_level
+            kwargs["accuracy_level"] = self.config.accuracy_level
 
         matmul_q4_node = onnx.helper.make_node(
             "MatMulNBits",