diff --git a/libcxx/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.pass.cpp b/libcxx/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.pass.cpp
--- a/libcxx/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.pass.cpp
+++ b/libcxx/test/libcxx/input.output/filesystems/class.directory_entry/directory_entry.mods/last_write_time.pass.cpp
@@ -9,7 +9,11 @@
 // UNSUPPORTED: c++03
 // ADDITIONAL_COMPILE_FLAGS: -I %S/../../../../../../src/filesystem
 
-// XFAIL: LIBCXX-WINDOWS-FIXME
+// This test relies on calling functions from the libcxx internal header
+// filesystem_common.h; the Windows implementation uses different
+// internals and doesn't provide the same set_file_times function as for
+// other platforms.
+// UNSUPPORTED: windows
 
 // <filesystem>