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 92fc6442ced..7a0d50c74e3 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
@@ -177,7 +177,7 @@ def _resolve_gdn_prefill_backend(
         return backend, "triton"
 
     head_k_dim = getattr(
-        vllm_config.model_config.hf_config, "linear_key_head_dim", None
+        vllm_config.model_config.hf_text_config, "linear_key_head_dim", None
     )
 
     supports_flashinfer = False
@@ -218,7 +218,7 @@ def _log_gdn_backend_decision(
 ) -> None:
     """Log the GDN prefill backend choice in the attention-selector style."""
     head_k_dim = getattr(
-        vllm_config.model_config.hf_config, "linear_key_head_dim", None
+        vllm_config.model_config.hf_text_config, "linear_key_head_dim", None
     )
     chosen = {
         "flashinfer": "FlashInfer",