diff --git a/src/org/dclermonte/siba/Siba.java b/src/org/dclermonte/siba/Siba.java
index fea1f9f..7e6b7f4 100644
--- a/src/org/dclermonte/siba/Siba.java
+++ b/src/org/dclermonte/siba/Siba.java
@@ -37,6 +37,11 @@ public class Siba
 {
 	private static Logger logger = LoggerFactory.getLogger(Siba.class);
 
+	private Siba()
+	{
+
+	}
+
 	public static void main(final String[] args)
 	{
 		// Configure log.
diff --git a/src/org/dclermonte/siba/cli/SibaCLI.java b/src/org/dclermonte/siba/cli/SibaCLI.java
index 9045815..3714237 100644
--- a/src/org/dclermonte/siba/cli/SibaCLI.java
+++ b/src/org/dclermonte/siba/cli/SibaCLI.java
@@ -38,6 +38,11 @@ public class SibaCLI
 	private static Logger logger = LoggerFactory.getLogger(SibaCLI.class);
 	private static final ResourceBundle BUNDLE = ResourceBundle.getBundle("org.dclermonte.siba.cli.messages"); //$NON-NLS-1$
 
+	private SibaCLI()
+	{
+
+	}
+
 	public static void backup(final File directoryToSave) throws SibaException
 	{
 		File result;
diff --git a/src/org/dclermonte/siba/gui/SibaGUI.java b/src/org/dclermonte/siba/gui/SibaGUI.java
index b965267..0407ca1 100644
--- a/src/org/dclermonte/siba/gui/SibaGUI.java
+++ b/src/org/dclermonte/siba/gui/SibaGUI.java
@@ -82,7 +82,7 @@ public class SibaGUI
 	 * @throws InstantiationException
 	 * @throws ClassNotFoundException
 	 */
-	public SibaGUI() throws ClassNotFoundException, InstantiationException, IllegalAccessException,
+	private SibaGUI() throws ClassNotFoundException, InstantiationException, IllegalAccessException,
 			UnsupportedLookAndFeelException, SibaException
 	{
 		final Locale locale;
diff --git a/src/org/dclermonte/siba/gui/utils/GUIToolBox.java b/src/org/dclermonte/siba/gui/utils/GUIToolBox.java
index 34c1e43..a69e6be 100644
--- a/src/org/dclermonte/siba/gui/utils/GUIToolBox.java
+++ b/src/org/dclermonte/siba/gui/utils/GUIToolBox.java
@@ -32,6 +32,10 @@ import javax.swing.UIManager;
  */
 public class GUIToolBox
 {
+	private GUIToolBox()
+	{
+
+	}
 
 	public static List<String> availableLookAndFeels()
 	{
diff --git a/src/org/dclermonte/siba/model/SibaManager.java b/src/org/dclermonte/siba/model/SibaManager.java
index efad62e..a44df1b 100644
--- a/src/org/dclermonte/siba/model/SibaManager.java
+++ b/src/org/dclermonte/siba/model/SibaManager.java
@@ -44,6 +44,11 @@ public class SibaManager
 {
 	private static final ResourceBundle BUNDLE = ResourceBundle.getBundle("org.dclermonte.siba.model.messages"); //$NON-NLS-1$
 
+	private SibaManager()
+	{
+
+	}
+
 	/**
 	 * This method perform the backup.
 	 *
diff --git a/src/org/dclermonte/siba/model/SibaUtils.java b/src/org/dclermonte/siba/model/SibaUtils.java
index 13c422e..6a5ad4a 100644
--- a/src/org/dclermonte/siba/model/SibaUtils.java
+++ b/src/org/dclermonte/siba/model/SibaUtils.java
@@ -40,6 +40,11 @@ import org.apache.commons.io.IOUtils;
  */
 public class SibaUtils
 {
+	private SibaUtils()
+	{
+
+	}
+
 	/**
 	 *
 	 * This method Generate the file with MD5.