diff --git a/vllm/attention/backends/abstract.py b/vllm/attention/backends/abstract.py
index fd3c3e8153ede..23c7830cd6264 100644
--- a/vllm/attention/backends/abstract.py
+++ b/vllm/attention/backends/abstract.py
@@ -75,7 +75,6 @@ def copy_blocks(
     ) -> None:
         raise NotImplementedError
 
-    @abstractmethod
     def advance_step(self, num_seqs: int, num_queries: int):
         raise NotImplementedError