diff --git a/libc/bionic/pthread_internal.h b/libc/bionic/pthread_internal.h
index 091f711..b8412d1 100644
--- a/libc/bionic/pthread_internal.h
+++ b/libc/bionic/pthread_internal.h
@@ -178,6 +178,10 @@
   bionic_tls* bionic_tls;
 
   int errno_value;
+
+  bionic_tcb* bionic_tcb;
+  char stack_mte_ringbuffer_vma_name_buffer[32];
+
   bool is_main() { return start_routine == nullptr; }
 };
 
@@ -209,6 +213,7 @@
 __LIBC_HIDDEN__ void __pthread_internal_remove(pthread_internal_t* thread);
 __LIBC_HIDDEN__ void __pthread_internal_remove_and_free(pthread_internal_t* thread);
 __LIBC_HIDDEN__ void __find_main_stack_limits(uintptr_t* low, uintptr_t* high);
+__LIBC_HIDDEN__ void* __allocate_stack_mte_ringbuffer(size_t n, pthread_internal_t* thread);
 
 static inline __always_inline bionic_tcb* __get_bionic_tcb() {
   return reinterpret_cast<bionic_tcb*>(&__get_tls()[MIN_TLS_SLOT]);