diff --git a/libc/bionic/pthread_internal.h b/libc/bionic/pthread_internal.h
index 77bdd85..ad8be66 100644
--- a/libc/bionic/pthread_internal.h
+++ b/libc/bionic/pthread_internal.h
@@ -115,7 +115,7 @@
 };
 
 __LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread);
-__LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread);
+__LIBC_HIDDEN__ bool __init_tls(pthread_internal_t* thread);
 __LIBC_HIDDEN__ void __init_thread_stack_guard(pthread_internal_t* thread);
 __LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*);