diff --git a/examples/normCast.cpp b/examples/normCast.cpp
index 7ed8876..924436d 100644
--- a/examples/normCast.cpp
+++ b/examples/normCast.cpp
@@ -1,6 +1,7 @@
 
 #include "normApi.h"
 #include <stdio.h>       // for printf(), etc
+#include <stdlib.h>      // for atoi(), etc
 
 #ifdef WIN32
 #include <windows.h>