diff --git a/NPLib/Utility/nptool-libmap.cxx b/NPLib/Utility/nptool-libmap.cxx
index 13dce0c5609ba364ff94bb840d1c2c0323b75c9c..2b04b871214173a0078ad7b5ff9043a8d5583e51 100644
--- a/NPLib/Utility/nptool-libmap.cxx
+++ b/NPLib/Utility/nptool-libmap.cxx
@@ -1,6 +1,6 @@
 #include<iostream>
 #include<fstream>
-#include<cstdlib.h>
+#include<stdlib.h>
 #include<dlfcn.h>
 #include<dirent.h>
 #include"NPDetectorFactory.h"