diff --git a/aes-32bit/aes.cpp b/aes-32bit/aes.cpp
index f1114fa..0edca5f 100644
--- a/aes-32bit/aes.cpp
+++ b/aes-32bit/aes.cpp
@@ -1,9 +1,7 @@
 #include <cstdio>
-#include <cstdlib>
 #include <iostream>
-#include <stdio.h>
 #include <stdint.h>
-#include <system_error>
+#include <stdlib.h>
 
 /* AES-128 simple implementation template and testing */