diff --git a/handler/src/main/java/io/netty/handler/timeout/IdleStateHandler.java b/handler/src/main/java/io/netty/handler/timeout/IdleStateHandler.java
index 949b4212d4..db3805e7a2 100644
--- a/handler/src/main/java/io/netty/handler/timeout/IdleStateHandler.java
+++ b/handler/src/main/java/io/netty/handler/timeout/IdleStateHandler.java
@@ -312,6 +312,8 @@ public class IdleStateHandler extends ChannelDuplexHandler {
         case 1:
         case 2:
             return;
+        default:
+             break;
         }
 
         state = 1;