diff --git a/build.xml b/build.xml
index 30f608f..d935e49 100644
--- a/build.xml
+++ b/build.xml
@@ -11,7 +11,7 @@
 	
 	<target name="compile" >
 		<mkdir dir="${classes.dir}" />
-		<javac srcdir="${src.dir}" destdir="${classes.dir}" />
+		<javac includeantruntime="false" srcdir="${src.dir}" destdir="${classes.dir}" />
 	</target>
 	
 	<target name="jar" depends="compile" >
diff --git a/src/spaceshipsim/SpaceShipSim.java b/src/spaceshipsim/SpaceShipSim.java
index 6750255..7a20822 100644
--- a/src/spaceshipsim/SpaceShipSim.java
+++ b/src/spaceshipsim/SpaceShipSim.java
@@ -115,5 +115,11 @@ public class SpaceShipSim {
 		frame.setJMenuBar(menuBar);
 	}
 
+	public class Window {
+		public Window(String title, String msg) {
+			JOptionPane.showMessageDialog(null, msg, title, JOptionPane.INFORMATION_MESSAGE);
+		}
+	}
+
 	public static void main(String[] args) { new SpaceShipSim(); }
 }
diff --git a/src/spaceshipsim/Window.java b/src/spaceshipsim/Window.java
deleted file mode 100644
index faff1bb..0000000
--- a/src/spaceshipsim/Window.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package spaceshipsim;
-
-import javax.swing.*;
-
-/**
- * @author Nicolás A. Ortega
- * @copyright Nicolás A. Ortega
- * @license GNU GPLv3
- * @year 2014
- * 
- */
-public class Window {
-	public Window(String title, String infoMessage) {
-		JOptionPane.showMessageDialog(null, infoMessage, title, JOptionPane.INFORMATION_MESSAGE);
-	}
-}
\ No newline at end of file