diff --git a/src/config.hpp b/src/config.hpp
index 3f3a544..014f013 100644
--- a/src/config.hpp
+++ b/src/config.hpp
@@ -1,5 +1,5 @@
-#ifndef __MAK_CONFIG_HPP
-#define __MAK_CONFIG_HPP
+#ifndef __COSMOTOOL_CONFIG_HPP
+#define __COSMOTOOL_CONFIG_HPP
 
 #include <stdint.h>
 #include <exception>