diff --git a/examples/org.eclipse.e4.demo.cssbridge/src/org/eclipse/e4/demo/cssbridge/internal/core/DummyMailService.java b/examples/org.eclipse.e4.demo.cssbridge/src/org/eclipse/e4/demo/cssbridge/internal/core/DummyMailService.java
index 65fb1cc4870..d9fb3e5a1b9 100644
--- a/examples/org.eclipse.e4.demo.cssbridge/src/org/eclipse/e4/demo/cssbridge/internal/core/DummyMailService.java
+++ b/examples/org.eclipse.e4.demo.cssbridge/src/org/eclipse/e4/demo/cssbridge/internal/core/DummyMailService.java
@@ -43,7 +43,6 @@ public List<Mail> getMails(FolderType type) {
 		return mails;
 	}
 
-	@SuppressWarnings("serial")
 	private Map<FolderType, List<Mail>> getFolderTypeToMails() {
 		if (folderTypeToMails == null) {
 			folderTypeToMails = new HashMap<>() {
@@ -56,7 +55,6 @@ private Map<FolderType, List<Mail>> getFolderTypeToMails() {
 		return folderTypeToMails;
 	}
 
-	@SuppressWarnings("serial")
 	private List<Mail> createDummyInboxFolderMails() {
 		return new ArrayList<>() {
 			{
@@ -101,7 +99,6 @@ private List<Mail> createDummyInboxFolderMails() {
 		};
 	}
 
-	@SuppressWarnings("serial")
 	private List<Mail> createDummySentFolderMails() {
 		return new ArrayList<>() {
 			{