diff --git a/src/Disks/IO/createReadBufferFromFileBase.cpp b/src/Disks/IO/createReadBufferFromFileBase.cpp
index 345d0019aa7..d87144dee55 100644
--- a/src/Disks/IO/createReadBufferFromFileBase.cpp
+++ b/src/Disks/IO/createReadBufferFromFileBase.cpp
@@ -52,7 +52,7 @@ std::unique_ptr<ReadBufferFromFileBase> createReadBufferFromFileBase(
     {
         try
         {
-            auto res = std::make_unique<MMapReadBufferFromFileWithCache>(*settings.mmap_cache, filename, 0);
+            auto res = std::make_unique<MMapReadBufferFromFileWithCache>(*settings.mmap_cache, filename, 0, file_size.value_or(-1));
             ProfileEvents::increment(ProfileEvents::CreatedReadBufferMMap);
             return res;
         }