diff --git a/src/main/java/org/jboss/netty/channel/DefaultChannelStateEvent.java b/src/main/java/org/jboss/netty/channel/DefaultChannelStateEvent.java
index 432b8f0810..2e4bc2c9b9 100644
--- a/src/main/java/org/jboss/netty/channel/DefaultChannelStateEvent.java
+++ b/src/main/java/org/jboss/netty/channel/DefaultChannelStateEvent.java
@@ -103,9 +103,9 @@ public class DefaultChannelStateEvent extends DefaultChannelEvent implements
                 buf.append("OP_READ_WRITE");
                 break;
             default:
-                buf.append("OP_");
+                buf.append("UNKNOWN(");
                 buf.append(getValue());
-                buf.append(" (?)");
+                buf.append(')');
             }
         }
         buf.append(')');