diff --git a/models/onnx_export.py b/models/onnx_export.py
index fe0287e..ca6bd50 100644
--- a/models/onnx_export.py
+++ b/models/onnx_export.py
@@ -17,6 +17,7 @@ if __name__ == '__main__':
     parser.add_argument('--img-size', nargs='+', type=int, default=[640, 640], help='image size')
     parser.add_argument('--batch-size', type=int, default=1, help='batch size')
     opt = parser.parse_args()
+    opt.img_size *= 2 if len(opt.img_size) == 1 else 1
     print(opt)
 
     # Parameters