diff --git a/src/buffer/lru_k_replacer.cpp b/src/buffer/lru_k_replacer.cpp
index 1313d94b0..af7af77ff 100644
--- a/src/buffer/lru_k_replacer.cpp
+++ b/src/buffer/lru_k_replacer.cpp
@@ -17,7 +17,7 @@ namespace bustub {
 
 LRUKReplacer::LRUKReplacer(size_t num_frames, size_t k) : replacer_size_(num_frames), k_(k) {}
 
-auto LRUKReplacer::Evict(frame_id_t *frame_id) -> bool { return false; }
+auto LRUKReplacer::Evict() -> std::optional<frame_id_t> { return std::nullopt; }
 
 void LRUKReplacer::RecordAccess(frame_id_t frame_id, [[maybe_unused]] AccessType access_type) {}