diff --git a/onnxruntime/test/shared_lib/test_model_loading.cc b/onnxruntime/test/shared_lib/test_model_loading.cc
index 921441f90b..b7f6f7f4b9 100644
--- a/onnxruntime/test/shared_lib/test_model_loading.cc
+++ b/onnxruntime/test/shared_lib/test_model_loading.cc
@@ -248,7 +248,8 @@ void FileMmap(const ORTCHAR_T* file_path, void*& mapped_base) {
   ASSERT_TRUE(file_descriptor.IsValid());
   struct stat sb;
   stat(file_path, &sb);
-  mapped_base = mmap(nullptr, sb.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, file_descriptor.Get(), 0);
+  mapped_base = mmap(nullptr, narrow<size_t>(sb.st_size), PROT_READ | PROT_WRITE,
+                     MAP_PRIVATE, file_descriptor.Get(), 0);
 #endif
   return;
 }
@@ -302,7 +303,7 @@ void TestLoadModelFromArrayWithExternalInitializerFromFileMmap(const std::string
 #else
   struct stat sb;
   stat(external_bin_path.c_str(), &sb);
-  int ret = munmap(mapped_base, sb.st_size);
+  int ret = munmap(mapped_base, narrow<size_t>(sb.st_size));
   ASSERT_TRUE(ret == 0);
 #endif