--- Source/bmalloc/libpas/src/libpas/pas_thread_local_cache.h.orig
+++ Source/bmalloc/libpas/src/libpas/pas_thread_local_cache.h
@@ -105,20 +105,14 @@
 static inline pas_thread_local_cache* pas_thread_local_cache_try_get(void)
 {
     pas_thread_local_cache* cache = pas_thread_local_cache_try_get_impl();
-#if !PAS_OS(DARWIN)
     if (((uintptr_t)cache) == PAS_THREAD_LOCAL_CACHE_DESTROYED)
         return NULL;
-#endif
     return cache;
 }
 
 static inline bool pas_thread_local_cache_can_set(void)
 {
-#if PAS_OS(DARWIN)
-    return !pthread_self_is_exiting_np() && !pas_msl_is_enabled();
-#else
     return ((uintptr_t)pas_thread_local_cache_try_get_impl()) != PAS_THREAD_LOCAL_CACHE_DESTROYED;
-#endif
 }
 
 static inline void pas_thread_local_cache_set_impl(pas_thread_local_cache* thread_local_cache)

--- Source/bmalloc/libpas/src/libpas/pas_thread_local_cache.c.orig
+++ Source/bmalloc/libpas/src/libpas/pas_thread_local_cache.c
@@ -147,7 +147,6 @@
     if (verbose)
         pas_log("[%d] Destructor call for TLS %p\n", getpid(), thread_local_cache);
 
-#if !PAS_OS(DARWIN)
     /* If pthread_self_is_exiting_np does not exist, we set PAS_THREAD_LOCAL_CACHE_DESTROYED in the TLS so that
        subsequent calls of pas_thread_local_cache_try_get() can detect whether TLS is destroyed. Since
        PAS_THREAD_LOCAL_CACHE_DESTROYED is a non-null value, pthread will call this destructor again (up to
@@ -155,7 +154,6 @@
        PAS_THREAD_LOCAL_CACHE_DESTROYED in the TLS each time to continue to indicate that destroy() has already been called once. */
     pas_thread_local_cache_set_impl((pas_thread_local_cache*)PAS_THREAD_LOCAL_CACHE_DESTROYED);
     PAS_ASSERT(!pas_thread_local_cache_can_set());
-#endif
 
     if (((uintptr_t)thread_local_cache) != PAS_THREAD_LOCAL_CACHE_DESTROYED)
         destroy(thread_local_cache, pas_lock_is_not_held);