diff --git a/table/bloom_block.cc b/table/bloom_block.cc
index c44ab66ca2c..cfea8a2c5d2 100644
--- a/table/bloom_block.cc
+++ b/table/bloom_block.cc
@@ -11,7 +11,7 @@
 
 namespace rocksdb {
 
-void BloomBlockBuilder::AddKeysHashes(const std::vector<uint32_t> keys_hashes) {
+void BloomBlockBuilder::AddKeysHashes(const std::vector<uint32_t>& keys_hashes) {
   for (auto hash : keys_hashes) {
     bloom_.AddHash(hash);
   }
diff --git a/table/bloom_block.h b/table/bloom_block.h
index d55453edaae..7ef5d14b6d5 100644
--- a/table/bloom_block.h
+++ b/table/bloom_block.h
@@ -26,7 +26,7 @@ class BloomBlockBuilder {
 
   uint32_t GetNumBlocks() const { return bloom_.GetNumBlocks(); }
 
-  void AddKeysHashes(const std::vector<uint32_t> keys_hashes);
+  void AddKeysHashes(const std::vector<uint32_t>& keys_hashes);
 
   Slice Finish();