diff --git a/include/store.h b/include/store.h
index e01e4090..63f8a392 100644
--- a/include/store.h
+++ b/include/store.h
@@ -334,6 +334,7 @@ public:
     }
 
     rocksdb::Status delete_range(const std::string& begin_key, const std::string& end_key) {
+        std::shared_lock lock(mutex);
         return db->DeleteRange(rocksdb::WriteOptions(), db->DefaultColumnFamily(), begin_key, end_key);
     }