diff --git a/rse/plugins/org.eclipse.rse.ui/model/org/eclipse/rse/internal/model/SystemPreferenceChangeEvent.java b/rse/plugins/org.eclipse.rse.ui/model/org/eclipse/rse/internal/model/SystemPreferenceChangeEvent.java
index 5f54f35f7be..47837ddb8fa 100644
--- a/rse/plugins/org.eclipse.rse.ui/model/org/eclipse/rse/internal/model/SystemPreferenceChangeEvent.java
+++ b/rse/plugins/org.eclipse.rse.ui/model/org/eclipse/rse/internal/model/SystemPreferenceChangeEvent.java
@@ -29,6 +29,7 @@ public class SystemPreferenceChangeEvent
 	   extends EventObject
 	   implements ISystemPreferenceChangeEvent
 {
+	private static final long serialVersionUID = 1; // DWD added for warning suppression remove this comment when tested.
 	private int type;
     private Object oldValue, newValue;
 	
diff --git a/rse/plugins/org.eclipse.rse.ui/model/org/eclipse/rse/model/SystemResourceChangeEvent.java b/rse/plugins/org.eclipse.rse.ui/model/org/eclipse/rse/model/SystemResourceChangeEvent.java
index 1b4c1225e32..9d0cbd462ef 100644
--- a/rse/plugins/org.eclipse.rse.ui/model/org/eclipse/rse/model/SystemResourceChangeEvent.java
+++ b/rse/plugins/org.eclipse.rse.ui/model/org/eclipse/rse/model/SystemResourceChangeEvent.java
@@ -30,6 +30,7 @@ public class SystemResourceChangeEvent
 	   extends EventObject
 	   implements ISystemResourceChangeEvent
 {
+	private static final long serialVersionUID = 1; // DWD needed for EventObjects remove comment after testing
 	private Object parent,grandparent, prevObj;
 	private Object[] multiSource;
 	private Viewer   originatingViewer;