diff --git a/stl/inc/xthreads.h b/stl/inc/xthreads.h
index e0c05e459c5..984bd75087a 100644
--- a/stl/inc/xthreads.h
+++ b/stl/inc/xthreads.h
@@ -32,12 +32,6 @@ struct _Stl_critical_section {
     _Smtx_t _M_srw_lock = nullptr;
 };
 
-#if defined(_CRT_WINDOWS) || defined(UNDOCKED_WINDOWS_UCRT)
-#pragma detect_mismatch("windows_mutex", "1")
-#else // ^^^ Windows private STL / public STL vvv
-#pragma detect_mismatch("windows_mutex", "0")
-#endif // ^^^ public STL ^^^
-
 struct _Mtx_internal_imp_t {
 #if defined(_CRT_WINDOWS) || defined(UNDOCKED_WINDOWS_UCRT)
 #ifdef _WIN64
@@ -53,7 +47,6 @@ struct _Mtx_internal_imp_t {
 #endif // ^^^ !defined(_WIN64) ^^^
 #endif // ^^^ public STL ^^^
 
-
     static constexpr size_t _Critical_section_align = alignof(void*);
 
     int _Type{};