diff --git a/src/resources/objects/creature/CreatureObject.java b/src/resources/objects/creature/CreatureObject.java
index a94fda019..7d3f2a18a 100644
--- a/src/resources/objects/creature/CreatureObject.java
+++ b/src/resources/objects/creature/CreatureObject.java
@@ -13,6 +13,8 @@ import resources.player.Player;
 
 public class CreatureObject extends TangibleObject {
 	
+	private static final long serialVersionUID = 1L;
+	
 	private Posture	posture					= Posture.STANDING;
 	private Race	race					= Race.HUMAN;
 	private int		attributes				= 0;
diff --git a/src/resources/objects/intangible/IntangibleObject.java b/src/resources/objects/intangible/IntangibleObject.java
index 4dce5c3a6..3b4999199 100644
--- a/src/resources/objects/intangible/IntangibleObject.java
+++ b/src/resources/objects/intangible/IntangibleObject.java
@@ -4,6 +4,8 @@ import resources.objects.SWGObject;
 
 public class IntangibleObject extends SWGObject {
 	
+	private static final long serialVersionUID = 1L;
+	
 	private int	count	= 0;
 	
 	public IntangibleObject(long objectId) {
diff --git a/src/resources/objects/player/PlayerObject.java b/src/resources/objects/player/PlayerObject.java
index 91244f302..9c745e399 100644
--- a/src/resources/objects/player/PlayerObject.java
+++ b/src/resources/objects/player/PlayerObject.java
@@ -12,6 +12,8 @@ import resources.player.Player;
 
 public class PlayerObject extends IntangibleObject {
 	
+	private static final long serialVersionUID = 1L;
+	
 	private String	profession		= "";
 	
 	private String	biography		= "";
diff --git a/src/resources/objects/tangible/TangibleObject.java b/src/resources/objects/tangible/TangibleObject.java
index b7ab95f4b..0bb18fd01 100644
--- a/src/resources/objects/tangible/TangibleObject.java
+++ b/src/resources/objects/tangible/TangibleObject.java
@@ -8,6 +8,8 @@ import resources.player.Player;
 
 public class TangibleObject extends SWGObject {
 	
+	private static final long serialVersionUID = 1L;
+	
 	private byte []	appearanceData	= new byte[0];
 	private int		damageTaken		= 0;
 	private int		maxHitPoints	= 0;