diff --git a/vllm/model_executor/models/qwen3_vl.py b/vllm/model_executor/models/qwen3_vl.py
index 1d3929b936a9..1076dcf2fb56 100644
--- a/vllm/model_executor/models/qwen3_vl.py
+++ b/vllm/model_executor/models/qwen3_vl.py
@@ -538,6 +538,7 @@ def forward(
             grid_thw_list = grid_thw
             grid_thw = np.array(grid_thw, dtype=np.int32)
         else:
+            grid_thw = grid_thw.to("cpu")
             grid_thw_list = grid_thw.tolist()
             grid_thw = grid_thw.numpy()