diff --git a/libc/bionic/clone.cpp b/libc/bionic/clone.cpp
index 2c507c4..d38a422 100644
--- a/libc/bionic/clone.cpp
+++ b/libc/bionic/clone.cpp
@@ -32,7 +32,7 @@
 #include <stdarg.h>
 
 extern "C" pid_t __bionic_clone(uint32_t flags, void* child_stack, int* parent_tid, void* tls, int* child_tid, int (*fn)(void*), void* arg);
-extern "C" void __exit(int status);
+extern "C" __noreturn void __exit(int status);
 
 // Called from the __bionic_clone assembler to call the thread function then exit.
 extern "C" __LIBC_HIDDEN__ void __bionic_clone_entry(int (*fn)(void*), void* arg) {
diff --git a/libc/bionic/pthread_exit.cpp b/libc/bionic/pthread_exit.cpp
index de818cd..2470c9c 100644
--- a/libc/bionic/pthread_exit.cpp
+++ b/libc/bionic/pthread_exit.cpp
@@ -34,8 +34,8 @@
 
 #include "pthread_internal.h"
 
-extern "C" void _exit_with_stack_teardown(void*, size_t);
-extern "C" void __exit(int);
+extern "C" __noreturn void _exit_with_stack_teardown(void*, size_t);
+extern "C" __noreturn void __exit(int);
 extern "C" int __set_tid_address(int*);
 
 /* CAVEAT: our implementation of pthread_cleanup_push/pop doesn't support C++ exceptions
@@ -127,7 +127,4 @@
 
     _exit_with_stack_teardown(stack_base, stack_size);
   }
-
-  // NOTREACHED, but we told the compiler this function is noreturn, and it doesn't believe us.
-  abort();
 }