diff --git a/docs/examples/smtp-mail.c b/docs/examples/smtp-mail.c
index ed9524e877..af4d1b65b1 100644
--- a/docs/examples/smtp-mail.c
+++ b/docs/examples/smtp-mail.c
@@ -133,5 +133,5 @@ int main(void)
     curl_easy_cleanup(curl);
   }
 
-  return 0;
+  return (int)res;
 }