diff --git a/vllm/model_executor/layers/mla.py b/vllm/model_executor/layers/mla.py
index dad960160f2a..1656f4deb671 100644
--- a/vllm/model_executor/layers/mla.py
+++ b/vllm/model_executor/layers/mla.py
@@ -24,9 +24,9 @@ class MLAModules:
     q_b_proj: torch.nn.Module | None
     q_proj: torch.nn.Module | None
     indexer: torch.nn.Module | None
-    indexer_rotary_emb: torch.nn.Module | None
     is_sparse: bool
     topk_indices_buffer: torch.Tensor | None
+    indexer_rotary_emb: torch.nn.Module | None = None
 
 
 @CustomOp.register("multi_head_latent_attention")