diff --git a/src/common/windows/http_upload.cc b/src/common/windows/http_upload.cc
index bd48a233..cd12a24e 100644
--- a/src/common/windows/http_upload.cc
+++ b/src/common/windows/http_upload.cc
@@ -536,7 +536,7 @@ namespace {
         return false;
       }
     }
-    request_body->append("--" + boundary_str + "--\r\n");
+    request_body->append("\r\n--" + boundary_str + "--\r\n");
     return true;
   }
 }