diff --git a/nomalloc.c b/nomalloc.c
--- a/nomalloc.c
+++ b/nomalloc.c
@@ -5,6 +5,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 
 struct Names {
     char *name;
@@ -30,5 +31,5 @@
     setStruct (&names);
     printStruct (&names);
 
-    return 0;
+    return EXIT_SUCCESS;
 }