diff --git a/build.xml b/build.xml
index ff919f1..122d2d5 100644
--- a/build.xml
+++ b/build.xml
@@ -50,6 +50,12 @@
 	<arg file="graphics/tiles.rc" />
 	<arg file="${builddir}/tiles.png" />
 </java>
+<java classname="micropolisj.build_tool.MakeTiles" classpath="${builddir}"
+	fork="true" dir="graphics">
+	<sysproperty key="tile_size" value="32" />
+	<arg file="graphics/tiles.rc" />
+	<arg file="${builddir}/tiles_32x32.png" />
+</java>
 <copy todir="${builddir}" file="graphics/tiles.rc" />
 </target>
 
diff --git a/src/micropolisj/build_tool/MakeTiles.java b/src/micropolisj/build_tool/MakeTiles.java
index 6e056f9..a113ac9 100644
--- a/src/micropolisj/build_tool/MakeTiles.java
+++ b/src/micropolisj/build_tool/MakeTiles.java
@@ -16,11 +16,19 @@ public class MakeTiles
 
 	static final Charset UTF8 = Charset.forName("UTF-8");
 	static final int NTILES = 960;
-	static final int TILE_SIZE = 16;
+	static int TILE_SIZE = 16;
 
 	public static void main(String [] args)
 		throws Exception
 	{
+		if (args.length != 2) {
+			throw new Exception("Wrong number of arguments");
+		}
+
+		if (System.getProperty("tile_size") != null) {
+			TILE_SIZE = Integer.parseInt(System.getProperty("tile_size"));
+		}
+
 		File recipeFile = new File(args[0]);
 		File outputFile = new File(args[1]);