diff --git a/python/tvm/relay/frontend/onnx.py b/python/tvm/relay/frontend/onnx.py
index 85fe01905b6e..14d3c40d40b3 100644
--- a/python/tvm/relay/frontend/onnx.py
+++ b/python/tvm/relay/frontend/onnx.py
@@ -3058,7 +3058,7 @@ def __init__(self, shape, dtype, freeze_params=False):
         self._renames = {}
         self._num_input = 0
         self._num_param = 0
-        self._shape = shape if shape else {}
+        self._shape = shape.copy() if shape else {}
         self._input_names = []
         self._dtype = dtype
         self.opset = None