diff --git a/libc/arch-common/bionic/atexit.h b/libc/arch-common/bionic/atexit.h
index bc776a8..16ae7aa 100644
--- a/libc/arch-common/bionic/atexit.h
+++ b/libc/arch-common/bionic/atexit.h
@@ -26,10 +26,11 @@
  * SUCH DAMAGE.
  */
 
-extern void *__dso_handle;
+extern void* __dso_handle;
+
+extern int __cxa_atexit(void (*)(void*), void*, void*);
 
 __attribute__ ((visibility ("hidden")))
-int atexit(void (*func)(void))
-{
-  return (__cxa_atexit((void (*)(void *))func, (void *)0, &__dso_handle));
+int atexit(void (*func)(void)) {
+  return (__cxa_atexit((void (*)(void*)) func, (void*) 0, &__dso_handle));
 }