diff --git a/scripts/convert_stable_diffusion_checkpoint_to_onnx.py b/scripts/convert_stable_diffusion_checkpoint_to_onnx.py
index 07dc21aa3b16..a388c0d078dc 100644
--- a/scripts/convert_stable_diffusion_checkpoint_to_onnx.py
+++ b/scripts/convert_stable_diffusion_checkpoint_to_onnx.py
@@ -206,7 +206,7 @@ def convert_models(model_path: str, output_path: str, opset: int):
     parser.add_argument(
         "--opset",
         default=14,
-        type=str,
+        type=int,
         help="The version of the ONNX operator set to use.",
     )