diff --git a/include/rocksdb/utilities/db_ttl.h b/include/rocksdb/utilities/db_ttl.h
index dd83cb24b..d57e7473a 100644
--- a/include/rocksdb/utilities/db_ttl.h
+++ b/include/rocksdb/utilities/db_ttl.h
@@ -57,7 +57,7 @@ class DBWithTTL : public StackableDB {
   static Status Open(const DBOptions& db_options, const std::string& dbname,
                      const std::vector<ColumnFamilyDescriptor>& column_families,
                      std::vector<ColumnFamilyHandle*>* handles,
-                     DBWithTTL** dbptr, std::vector<int32_t> ttls,
+                     DBWithTTL** dbptr, const std::vector<int32_t>& ttls,
                      bool read_only = false);
 
   virtual void SetTtl(int32_t ttl) = 0;
diff --git a/utilities/ttl/db_ttl_impl.cc b/utilities/ttl/db_ttl_impl.cc
index 9ebaa247f..ac3a3d17d 100644
--- a/utilities/ttl/db_ttl_impl.cc
+++ b/utilities/ttl/db_ttl_impl.cc
@@ -91,8 +91,7 @@ Status DBWithTTL::Open(
     const DBOptions& db_options, const std::string& dbname,
     const std::vector<ColumnFamilyDescriptor>& column_families,
     std::vector<ColumnFamilyHandle*>* handles, DBWithTTL** dbptr,
-    std::vector<int32_t> ttls, bool read_only) {
-
+    const std::vector<int32_t>& ttls, bool read_only) {
   if (ttls.size() != column_families.size()) {
     return Status::InvalidArgument(
         "ttls size has to be the same as number of column families");