diff --git a/python/sglang/multimodal_gen/runtime/platforms/interface.py b/python/sglang/multimodal_gen/runtime/platforms/interface.py
index e3e209793..7b78168ab 100644
--- a/python/sglang/multimodal_gen/runtime/platforms/interface.py
+++ b/python/sglang/multimodal_gen/runtime/platforms/interface.py
@@ -79,6 +79,7 @@ class Platform:
     _enum: PlatformEnum
     device_name: str
     device_type: str
+    device: torch.device | None = None  # Dummy attribute for compatibility
 
     # available dispatch keys:
     # check https://github.com/pytorch/pytorch/blob/313dac6c1ca0fa0cde32477509cce32089f8532a/torchgen/model.py#L134 # noqa