diff --git a/llvm/unittests/Support/Path.cpp b/llvm/unittests/Support/Path.cpp
index b63ab426bb080..31599f6152e92 100644
--- a/llvm/unittests/Support/Path.cpp
+++ b/llvm/unittests/Support/Path.cpp
@@ -2040,7 +2040,7 @@ TEST_F(FileSystemTest, SetLastAccessAndModificationTimeDirectory) {
 TEST_F(FileSystemTest, OpenDirectoryAsFileForRead) {
   std::string Buf(5, '?');
   Expected<fs::file_t> FD = fs::openNativeFileForRead(TestDirectory);
-#ifdef _WIN32
+#if defined(_WIN32) || defined(_AIX) || defined(__MVS__)
   EXPECT_EQ(errorToErrorCode(FD.takeError()), errc::is_a_directory);
 #else
   ASSERT_THAT_EXPECTED(FD, Succeeded());