diff --git a/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp b/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
--- a/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
+++ b/libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp
@@ -9,10 +9,6 @@
 // test libc++'s implementation of align_val_t, and the relevant new/delete
 // overloads in all dialects when -faligned-allocation is present.
 
-// Libc++ defers to the underlying MSVC library to provide the new/delete
-// definitions, which does not yet provide aligned allocation
-// XFAIL: LIBCXX-WINDOWS-FIXME
-
 // XFAIL: LIBCXX-AIX-FIXME
 
 // The dylibs shipped before macosx10.13 do not contain the aligned allocation
@@ -115,14 +111,14 @@
 
 #ifndef NO_ALIGN
 void operator delete(void* p, std::align_val_t a)TEST_NOEXCEPT {
-  ::free(p);
+  std::__libcpp_aligned_free(p);
   stats.aligned_called++;
   stats.last_align = static_cast<int>(a);
   stats.last_size = -1;
 }
 
 void operator delete(void* p, size_t n, std::align_val_t a)TEST_NOEXCEPT {
-  ::free(p);
+  std::__libcpp_aligned_free(p);
   stats.aligned_sized_called++;
   stats.last_align = static_cast<int>(a);
   stats.last_size = n;