diff --git a/lib/stdlib/atexit.c b/lib/stdlib/atexit.c
index 218ae854..1e99a1bb 100644
--- a/lib/stdlib/atexit.c
+++ b/lib/stdlib/atexit.c
@@ -25,4 +25,5 @@ int
 atexit (void (*function) (void))
 {
   __call_at_exit = function;
+  return 0;
 }