diff --git a/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/DefaultFullBinaryMemcacheRequest.java b/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/DefaultFullBinaryMemcacheRequest.java
index 04f46c55b2..8a04b8cf2e 100644
--- a/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/DefaultFullBinaryMemcacheRequest.java
+++ b/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/DefaultFullBinaryMemcacheRequest.java
@@ -65,45 +65,59 @@ public class DefaultFullBinaryMemcacheRequest extends DefaultBinaryMemcacheReque
 
     @Override
     public FullBinaryMemcacheRequest retain() {
+        super.retain();
         content.retain();
         return this;
     }
 
     @Override
     public FullBinaryMemcacheRequest retain(int increment) {
+        super.retain(increment);
         content.retain(increment);
         return this;
     }
 
     @Override
     public FullBinaryMemcacheRequest touch() {
+        super.touch();
         content.touch();
         return this;
     }
 
     @Override
     public FullBinaryMemcacheRequest touch(Object hint) {
+        super.touch(hint);
         content.touch(hint);
         return this;
     }
 
     @Override
     public boolean release() {
+        super.release();
         return content.release();
     }
 
     @Override
     public boolean release(int decrement) {
+        super.release(decrement);
         return content.release(decrement);
     }
 
     @Override
     public FullBinaryMemcacheRequest copy() {
-        return new DefaultFullBinaryMemcacheRequest(getKey(), getExtras(), content().copy());
+        ByteBuf extras = getExtras();
+        if (extras != null) {
+            extras = extras.copy();
+        }
+        return new DefaultFullBinaryMemcacheRequest(getKey(), extras, content().copy());
     }
 
     @Override
     public FullBinaryMemcacheRequest duplicate() {
-        return new DefaultFullBinaryMemcacheRequest(getKey(), getExtras(), content().duplicate());
+        ByteBuf extras = getExtras();
+        if (extras != null) {
+            extras = extras.duplicate();
+        }
+        return new DefaultFullBinaryMemcacheRequest(getKey(), extras, content().duplicate());
     }
 }
diff --git a/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/DefaultFullBinaryMemcacheResponse.java b/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/DefaultFullBinaryMemcacheResponse.java
index 87a3f4a45f..cc210df9b1 100644
--- a/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/DefaultFullBinaryMemcacheResponse.java
+++ b/codec-memcache/src/main/java/io/netty/handler/codec/memcache/binary/DefaultFullBinaryMemcacheResponse.java
@@ -65,45 +65,59 @@ public class DefaultFullBinaryMemcacheResponse extends DefaultBinaryMemcacheResp
 
     @Override
     public FullBinaryMemcacheResponse retain() {
+        super.retain();
         content.retain();
         return this;
     }
 
     @Override
     public FullBinaryMemcacheResponse retain(int increment) {
+        super.retain(increment);
         content.retain(increment);
         return this;
     }
 
     @Override
     public FullBinaryMemcacheResponse touch() {
+        super.touch();
         content.touch();
         return this;
     }
 
     @Override
     public FullBinaryMemcacheResponse touch(Object hint) {
+        super.touch(hint);
         content.touch(hint);
         return this;
     }
 
     @Override
     public boolean release() {
+        super.release();
         return content.release();
     }
 
     @Override
     public boolean release(int decrement) {
+        super.release(decrement);
         return content.release(decrement);
     }
 
     @Override
     public FullBinaryMemcacheResponse copy() {
-        return new DefaultFullBinaryMemcacheResponse(getKey(), getExtras(), content().copy());
+        ByteBuf extras = getExtras();
+        if (extras != null) {
+            extras = extras.copy();
+        }
+        return new DefaultFullBinaryMemcacheResponse(getKey(), extras, content().copy());
     }
 
     @Override
     public FullBinaryMemcacheResponse duplicate() {
-        return new DefaultFullBinaryMemcacheResponse(getKey(), getExtras(), content().duplicate());
+        ByteBuf extras = getExtras();
+        if (extras != null) {
+            extras = extras.duplicate();
+        }
+        return new DefaultFullBinaryMemcacheResponse(getKey(), extras, content().duplicate());
     }
 }