diff --git a/fs_mgr/liblp/super_layout_builder.cpp b/fs_mgr/liblp/super_layout_builder.cpp
index fd7416bb2..bff26ea21 100644
--- a/fs_mgr/liblp/super_layout_builder.cpp
+++ b/fs_mgr/liblp/super_layout_builder.cpp
@@ -184,7 +184,7 @@ std::vector<SuperImageExtent> SuperLayoutBuilder::GetImageLayout() {
                 return {};
             }
 
-            size_t size = e.num_sectors * LP_SECTOR_SIZE;
+            uint64_t size = e.num_sectors * LP_SECTOR_SIZE;
             uint64_t super_offset = e.target_data * LP_SECTOR_SIZE;
             extents.emplace_back(super_offset, size, image_name, image_offset);