diff --git a/libc/bionic/pthread_internal.h b/libc/bionic/pthread_internal.h
index 8cca83a..52cfbce 100644
--- a/libc/bionic/pthread_internal.h
+++ b/libc/bionic/pthread_internal.h
@@ -42,6 +42,9 @@
     __pthread_cleanup_t*        cleanup_stack;
     void**                      tls;         /* thread-local storage area */
 
+    void* (*start_routine)(void*);
+    void* start_routine_arg;
+
     void* alternate_signal_stack;
 
     /*
@@ -52,8 +55,12 @@
     char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE];
 };
 
+extern "C" {
+  __LIBC_HIDDEN__ int __thread_entry(void* arg); // Called from assembler.
+}
 __LIBC_HIDDEN__ int _init_thread(pthread_internal_t* thread, bool add_to_thread_list);
 __LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread);
+__LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*);
 __LIBC_HIDDEN__ void _pthread_internal_add(pthread_internal_t* thread);
 __LIBC_HIDDEN__ pthread_internal_t* __get_thread(void);