diff --git a/src/Storages/StorageFile.cpp b/src/Storages/StorageFile.cpp
index f6ce93b0688..2eb07d77e1b 100644
--- a/src/Storages/StorageFile.cpp
+++ b/src/Storages/StorageFile.cpp
@@ -620,7 +620,7 @@ public:
 
                 const Settings & settings = context->getSettingsRef();
                 chassert(!storage->paths.empty());
-                const auto max_parsing_threads = std::max(settings.max_threads / storage->paths.size(), 1UL);
+                const auto max_parsing_threads = std::max(settings.max_threads / storage->paths.size(), 1ULL);
                 auto format
                     = context->getInputFormat(storage->format_name, *read_buf, block_for_format, max_block_size, storage->format_settings, max_parsing_threads);