diff --git a/native/create_database.cc b/native/create_database.cc
index a7de049..6d109d0 100644
--- a/native/create_database.cc
+++ b/native/create_database.cc
@@ -953,7 +953,7 @@ void process_string_property(const std::string& property_name,
     // We have to start by reading everything in
 
     std::vector<
-        moodycamel::BlockingConcurrentQueue<std::pair<std::string, size_t>>>
+        moodycamel::BlockingConcurrentQueue<std::pair<std::string, uint64_t>>>
         queues(num_threads);
 
     moodycamel::LightweightSemaphore write_semaphore(QUEUE_SIZE * num_threads);