diff --git a/test/Interop/Cxx/stdlib/use-std-span.swift b/test/Interop/Cxx/stdlib/use-std-span.swift
index 9ab5cb833d899..a6d373080d821 100644
--- a/test/Interop/Cxx/stdlib/use-std-span.swift
+++ b/test/Interop/Cxx/stdlib/use-std-span.swift
@@ -4,6 +4,9 @@
 // FIXME swift-ci linux tests do not support std::span
 // UNSUPPORTED: OS=linux-gnu
 
+// TODO: test failed in Windows PR testing: rdar://144384453
+// UNSUPPORTED: OS=windows-msvc
+
 // REQUIRES: executable_test
 
 import StdlibUnittest
diff --git a/test/Interop/Cxx/stdlib/use-std-string-view.swift b/test/Interop/Cxx/stdlib/use-std-string-view.swift
index 4ae1c18a4c5b8..4477cc74ae710 100644
--- a/test/Interop/Cxx/stdlib/use-std-string-view.swift
+++ b/test/Interop/Cxx/stdlib/use-std-string-view.swift
@@ -5,6 +5,9 @@
 
 // REQUIRES: executable_test
 
+// TODO: test failed in Windows PR testing: rdar://144384453
+// UNSUPPORTED: OS=windows-msvc
+
 import StdlibUnittest
 import CxxStdlib
 import StdStringView