diff --git a/src/main/java/org/jboss/netty/handler/codec/replay/ReplayingDecoder.java b/src/main/java/org/jboss/netty/handler/codec/replay/ReplayingDecoder.java
index 13ceb5aecf..6ebf88a084 100644
--- a/src/main/java/org/jboss/netty/handler/codec/replay/ReplayingDecoder.java
+++ b/src/main/java/org/jboss/netty/handler/codec/replay/ReplayingDecoder.java
@@ -567,9 +567,10 @@ public abstract class ReplayingDecoder<T extends Enum<T>>
     private ChannelBuffer cumulation(ChannelHandlerContext ctx) {
         ChannelBuffer buf = this.cumulation;
         if (buf == null) {
-            ChannelBufferFactory factory = ctx.getChannel().getConfig().getBufferFactory();
-            buf = new UnsafeDynamicChannelBuffer(factory);
+            
             if (cumulation == null) {
+                ChannelBufferFactory factory = ctx.getChannel().getConfig().getBufferFactory();
+                buf = new UnsafeDynamicChannelBuffer(factory);
                 cumulation = buf;
                 replayable = new ReplayingDecoderBuffer(buf);
             } else {