diff --git a/vllm/attention/backends/registry.py b/vllm/attention/backends/registry.py
index 416b996df9f22..77724a3a1915c 100644
--- a/vllm/attention/backends/registry.py
+++ b/vllm/attention/backends/registry.py
@@ -66,7 +66,6 @@ class AttentionBackendEnum(Enum, metaclass=_AttentionBackendEnumMeta):
         "vllm.v1.attention.backends.mla.flashmla_sparse.FlashMLASparseBackend"
     )
     FLASH_ATTN_MLA = "vllm.v1.attention.backends.mla.flashattn_mla.FlashAttnMLABackend"
-    PALLAS = "vllm.v1.attention.backends.pallas.PallasAttentionBackend"
     IPEX = "vllm.v1.attention.backends.ipex.IpexAttentionBackend"
     NO_ATTENTION = "vllm.v1.attention.backends.no_attention.NoAttentionBackend"
     FLEX_ATTENTION = "vllm.v1.attention.backends.flex_attention.FlexAttentionBackend"