@@ -17,11 +17,6 @@
 // CPython never uses mimalloc's C++ operator new APIs, so don't define a weak
 // std::get_new_handler() (_ZSt15get_new_handlerv) in libpython.
 #  define MI_NO_CXX_NEW_HANDLER 1
-#  ifdef MS_WINDOWS
-// Initialize from a CRT initializer and use FLS for thread cleanup instead
-// of TLS callbacks, which run during DLL attach before the CRT is set up.
-#    define MI_WIN_INIT_USE_FLS 1
-#  endif
 #  ifdef Py_GIL_DISABLED
 #    define MI_PRIM_THREAD_ID   _Py_ThreadId
 #    define MI_CPYTHON 1