diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp
index 42507f776826..09fe3c5a73f9 100644
--- a/lld/ELF/Writer.cpp
+++ b/lld/ELF/Writer.cpp
@@ -82,7 +82,7 @@ private:
 
   std::vector<PhdrEntry *> Phdrs;
 
-  uint64_t FileSize;
+  size_t FileSize;
   uint64_t SectionHeaderOff;
 };
 } // anonymous namespace