diff --git a/codec/src/main/java/io/netty/handler/codec/ByteToByteEncoder.java b/codec/src/main/java/io/netty/handler/codec/ByteToByteEncoder.java
index 55ef2ac98f..4364f9c1ca 100644
--- a/codec/src/main/java/io/netty/handler/codec/ByteToByteEncoder.java
+++ b/codec/src/main/java/io/netty/handler/codec/ByteToByteEncoder.java
@@ -27,7 +27,6 @@ public abstract class ByteToByteEncoder extends ChannelOutboundByteHandlerAdapte
         ByteBuf in = ctx.outboundByteBuffer();
         ByteBuf out = ctx.nextOutboundByteBuffer();
 
-        int oldOutSize = out.readableBytes();
         while (in.readable()) {
             int oldInSize = in.readableBytes();
             try {