diff --git a/include/mimalloc-internal.h b/include/mimalloc-internal.h
index e3e78e40..df700d39 100644
--- a/include/mimalloc-internal.h
+++ b/include/mimalloc-internal.h
@@ -707,7 +707,11 @@ static inline void* mi_tls_slot(size_t slot) mi_attr_noexcept {
   res = tcb[slot];
 #elif defined(__aarch64__)
   void** tcb; UNUSED(ofs);
+#if defined(__MACH__)
+  __asm__ volatile ("mrs %0, tpidrro_el0" : "=r" (tcb));
+#else
   __asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb));
+#endif
   res = tcb[slot];
 #endif
   return res;
@@ -730,7 +734,11 @@ static inline void mi_tls_slot_set(size_t slot, void* value) mi_attr_noexcept {
   tcb[slot] = value;
 #elif defined(__aarch64__)
   void** tcb; UNUSED(ofs);
+#if defined(__MACH__)
+  __asm__ volatile ("mrs %0, tpidrro_el0" : "=r" (tcb));
+#else
   __asm__ volatile ("mrs %0, tpidr_el0" : "=r" (tcb));
+#endif
   tcb[slot] = value;
 #endif
 }