1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/Support/raw_ostream.cpp b/llvm/lib/Support/raw_ostream.cpp
index 92c7967cd8f..c51f1d376b0 100644
--- a/llvm/lib/Support/raw_ostream.cpp
+++ b/llvm/lib/Support/raw_ostream.cpp
@@ -598,7 +598,11 @@ void raw_fd_ostream::close() {
 uint64_t raw_fd_ostream::seek(uint64_t off) {
   assert(SupportsSeeking && "Stream does not support seeking!");
   flush();
-  pos = ::lseek(FD, off, SEEK_SET);
+#ifdef LLVM_ON_WIN32
+  pos = ::_lseeki64(FD, off, SEEK_SET);
+#else
+  pos = ::lseek64(FD, off, SEEK_SET);
+#endif
   if (pos == (uint64_t)-1)
     error_detected();
   return pos;