diff --git a/src/main/java/org/jboss/netty/channel/DefaultChannelFuture.java b/src/main/java/org/jboss/netty/channel/DefaultChannelFuture.java
index f1ce382026..3563ed8f6f 100644
--- a/src/main/java/org/jboss/netty/channel/DefaultChannelFuture.java
+++ b/src/main/java/org/jboss/netty/channel/DefaultChannelFuture.java
@@ -80,7 +80,7 @@ public class DefaultChannelFuture implements ChannelFuture {
     }
 
     public synchronized boolean isSuccess() {
-        return cause == null;
+        return done && cause == null;
     }
 
     public synchronized Throwable getCause() {