diff --git a/cpp/tensorrt_llm/executor/serialization.cpp b/cpp/tensorrt_llm/executor/serialization.cpp
index ad41c1f176..7f347dc6e7 100644
--- a/cpp/tensorrt_llm/executor/serialization.cpp
+++ b/cpp/tensorrt_llm/executor/serialization.cpp
@@ -2519,6 +2519,7 @@ size_t Serialization::serializedSize(tensorrt_llm::batch_manager::kv_cache_manag
     totalSize += su::serializedSize(key.uniqueTokens);
     // std::vector<MmKey> where MmKey is pair<std::array<uint8_t,32>, SizeType32>
     totalSize += su::serializedSize(key.extraKeys);
+    totalSize += su::serializedSize(key.cacheSaltID);
     return totalSize;
 }
 
@@ -2528,6 +2529,7 @@ void Serialization::serialize(tensorrt_llm::batch_manager::kv_cache_manager::Blo
     su::serialize(key.loraTaskId, os);
     su::serialize(key.uniqueTokens, os);
     su::serialize(key.extraKeys, os);
+    su::serialize(key.cacheSaltID, os);
 }
 
 tensorrt_llm::batch_manager::kv_cache_manager::BlockKey Serialization::deserializeBlockKey(std::istream& is)
@@ -2536,11 +2538,13 @@ tensorrt_llm::batch_manager::kv_cache_manager::BlockKey Serialization::deseriali
     auto loraTaskId = su::deserialize<std::optional<tensorrt_llm::batch_manager::kv_cache_manager::LoraTaskIdType>>(is);
     auto uniqueTokens = su::deserialize<std::vector<tensorrt_llm::runtime::UniqueToken>>(is);
     auto extraKeys = su::deserialize<std::vector<tensorrt_llm::batch_manager::kv_cache_manager::MmKey>>(is);
+    auto cacheSaltID = su::deserialize<std::optional<CacheSaltIDType>>(is);
     tensorrt_llm::batch_manager::kv_cache_manager::BlockKey key;
     key.usesExtraIds = usesExtraIds;
     key.loraTaskId = std::move(loraTaskId);
     key.uniqueTokens = std::move(uniqueTokens);
     key.extraKeys = std::move(extraKeys);
+    key.cacheSaltID = std::move(cacheSaltID);
     return key;
 }