diff --git a/bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/events/ExpansionEvent.java b/bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/events/ExpansionEvent.java
index 149575a..1ebc3ff 100644
--- a/bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/events/ExpansionEvent.java
+++ b/bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/events/ExpansionEvent.java
@@ -16,6 +16,7 @@
  * @since 3.0
  */
 public final class ExpansionEvent extends TypedEvent {
+	private static final long serialVersionUID = 6009335074727417445L;
 	/**
 	 * Creates a new expansion ecent.
 	 * 
diff --git a/bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/events/HyperlinkEvent.java b/bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/events/HyperlinkEvent.java
index f1e8ece..35d0672 100644
--- a/bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/events/HyperlinkEvent.java
+++ b/bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/events/HyperlinkEvent.java
@@ -17,6 +17,7 @@
  * @since 3.0
  */
 public final class HyperlinkEvent extends TypedEvent {
+	private static final long serialVersionUID = 6009335074727417445L;
 	private String label;
 	private int stateMask;
 	/**