diff --git a/libc/src/stdlib/exit.cpp b/libc/src/stdlib/exit.cpp
--- a/libc/src/stdlib/exit.cpp
+++ b/libc/src/stdlib/exit.cpp
@@ -19,6 +19,7 @@
 LLVM_LIBC_FUNCTION(void, exit, (int status)) {
   internal::call_exit_callbacks();
   quick_exit(status);
+  __builtin_unreachable();
 }
 
 } // namespace __llvm_libc