diff --git a/build.xml b/build.xml
index ae30430..29e1381 100644
--- a/build.xml
+++ b/build.xml
@@ -62,7 +62,7 @@
 <map from="${basedir}" to="." />
 </pathconvert>
 
-<jar destfile="${distfile}" basedir="${builddir}">
+<jar destfile="${distfile}" basedir="${builddir}" excludes="/micropolisj/build_tool/**">
 	<manifest>
 		<attribute name="Main-Class" value="micropolisj.Main" />
 		<attribute name="Class-Path" value="${runtime-classpath}" />
diff --git a/graphics/MakeTiles.java b/src/micropolisj/build_tool/MakeTiles.java
similarity index 98%
rename from graphics/MakeTiles.java
rename to src/micropolisj/build_tool/MakeTiles.java
index 219b15c..259fae0 100644
--- a/graphics/MakeTiles.java
+++ b/src/micropolisj/build_tool/MakeTiles.java
@@ -1,3 +1,5 @@
+package micropolisj.build_tool;
+
 import java.awt.*;
 import java.awt.image.BufferedImage;
 import java.io.*;