diff --git a/vllm/model_executor/layers/mamba/gdn/qwen_gdn_linear_attn.py b/vllm/model_executor/layers/mamba/gdn/qwen_gdn_linear_attn.py
index 3f13dc19d3..1cebc9bae9 100644
--- a/vllm/model_executor/layers/mamba/gdn/qwen_gdn_linear_attn.py
+++ b/vllm/model_executor/layers/mamba/gdn/qwen_gdn_linear_attn.py
@@ -1453,7 +1453,7 @@ class QwenGatedDeltaNetAttention(GatedDeltaNetAttention):
         if (
             spec_sequence_masks is not None
             and mixed_qkv_spec is not None
-            and self.use_gdn_recoverssm
+            and getattr(self, "use_gdn_recoverssm", False)
         ):
             query_spec, key_spec, value_spec, verify_views = (
                 self._recoverssm_verify_qkv(mixed_qkv_spec)