diff --git a/core_generator/build.rs b/core_generator/build.rs
index d69a66e..7252cc7 100644
--- a/core_generator/build.rs
+++ b/core_generator/build.rs
@@ -1,5 +1,7 @@
 extern crate avr_mcu;
 
+mod gen;
+
 use avr_mcu::*;
 use std::fs::{self, File};
 use std::io;
@@ -84,5 +86,3 @@ fn write_core_module(mcu: &Mcu, w: &mut Write) -> Result<(), io::Error> {
     writeln!(w)
 }
 
-mod gen;
-