diff --git a/src/petals/client/remote_generation.py b/src/petals/client/remote_generation.py
index 0249c0b..0060ede 100644
--- a/src/petals/client/remote_generation.py
+++ b/src/petals/client/remote_generation.py
@@ -38,7 +38,7 @@ class RemotePastKeyValues(Cache):
         self.seen_tokens += new_seen
 
     def reorder_cache(self, beam_idx):
-        pass
+        raise NotImplementedError("Beam search reordering is not implemented yet")
 
 
 _skipped_tokens = ContextVar("skipped_tokens", default=0)