diff --git a/onnxruntime/test/platform/path_lib_test.cc b/onnxruntime/test/platform/path_lib_test.cc
index 4dfd1eb230..e14c7d4d7c 100644
--- a/onnxruntime/test/platform/path_lib_test.cc
+++ b/onnxruntime/test/platform/path_lib_test.cc
@@ -1,9 +1,6 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-#include "core/platform/path_lib.h"
-
-#include "gtest/gtest.h"
 #include <string>
 
 #include "gtest/gtest.h"
@@ -11,6 +8,12 @@
 #include "core/platform/env.h"
 #include "test/framework/test_utils.h"
 
+// Windows.h reserves the word OPTIONAL in macro, which introduces
+// conflict on variables declared from onnx external library. Currently workaround
+// this by re-ordering the included files.
+// TODO: undefine OPTIONAL in path_lib.h and move path_lib.h to the first include
+#include "core/platform/path_lib.h"
+
 namespace onnxruntime {
 namespace test {