diff --git a/tiny_gltf.h b/tiny_gltf.h
index d6ea795..4f8fcd2 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -2597,7 +2597,7 @@ bool FileExists(const std::string &abs_filename, void *) {
   }
 #else
 #ifdef _WIN32
-#if defined(_MSC_VER) || defined(__GLIBCXX__)
+#if defined(_MSC_VER) || defined(__GLIBCXX__) || defined(_LIBCPP_VERSION)
   FILE *fp = nullptr;
   errno_t err = _wfopen_s(&fp, UTF8ToWchar(abs_filename).c_str(), L"rb");
   if (err != 0) {