diff --git a/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheEncoder.java b/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheEncoder.java
index a58243465f..a9dcffb68f 100644
--- a/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheEncoder.java
+++ b/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/BinaryMemcacheEncoder.java
@@ -50,7 +50,7 @@ public abstract class BinaryMemcacheEncoder<M extends BinaryMemcacheMessage<H>,
      * @param extras the extras to encode.
      */
     private static void encodeExtras(ByteBuf buf, ByteBuf extras) {
-        if (extras == null || extras.readableBytes() == 0) {
+        if (extras == null || !extras.isReadable()) {
             return;
         }