diff --git a/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/Configuration.java b/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/Configuration.java
index 8ca544c1521..208923551f0 100644
--- a/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/Configuration.java
+++ b/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/Configuration.java
@@ -79,16 +79,16 @@ public interface Configuration
         void customize(Configuration configurable);
     }
 
-    class ConfigurationHolder implements Configuration
+    class ConfigurationCustomizer implements Configuration, Customizer
     {
-        protected Duration idleTimeout;
-        protected Duration writeTimeout;
-        protected Boolean autoFragment;
-        protected Long maxFrameSize;
-        protected Integer outputBufferSize;
-        protected Integer inputBufferSize;
-        protected Long maxBinaryMessageSize;
-        protected Long maxTextMessageSize;
+        private Duration idleTimeout;
+        private Duration writeTimeout;
+        private Boolean autoFragment;
+        private Long maxFrameSize;
+        private Integer outputBufferSize;
+        private Integer inputBufferSize;
+        private Long maxBinaryMessageSize;
+        private Long maxTextMessageSize;
 
         @Override
         public Duration getIdleTimeout()
@@ -185,10 +185,7 @@ public interface Configuration
         {
             this.maxTextMessageSize = maxTextMessageSize;
         }
-    }
 
-    class ConfigurationCustomizer extends ConfigurationHolder implements Customizer
-    {
         @Override
         public void customize(Configuration configurable)
         {
diff --git a/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/internal/FragmentExtension.java b/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/internal/FragmentExtension.java
index 6cb3a969e21..6d1cecab62a 100644
--- a/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/internal/FragmentExtension.java
+++ b/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/internal/FragmentExtension.java
@@ -35,7 +35,7 @@ public class FragmentExtension extends AbstractExtension
     private static final Logger LOG = Log.getLogger(FragmentExtension.class);
 
     private final FragmentingFlusher flusher;
-    private final Configuration configuration = new Configuration.ConfigurationHolder();
+    private final Configuration configuration = new Configuration.ConfigurationCustomizer();
 
     public FragmentExtension()
     {
diff --git a/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/internal/Parser.java b/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/internal/Parser.java
index 7748273d0c2..9ba506a8218 100644
--- a/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/internal/Parser.java
+++ b/jetty-websocket/websocket-core/src/main/java/org/eclipse/jetty/websocket/core/internal/Parser.java
@@ -28,7 +28,6 @@ import org.eclipse.jetty.util.log.Log;
 import org.eclipse.jetty.util.log.Logger;
 import org.eclipse.jetty.websocket.core.CloseStatus;
 import org.eclipse.jetty.websocket.core.Configuration;
-import org.eclipse.jetty.websocket.core.Configuration.ConfigurationHolder;
 import org.eclipse.jetty.websocket.core.Frame;
 import org.eclipse.jetty.websocket.core.OpCode;
 import org.eclipse.jetty.websocket.core.exception.MessageTooLargeException;
@@ -65,7 +64,7 @@ public class Parser
 
     public Parser(ByteBufferPool bufferPool)
     {
-        this(bufferPool, new ConfigurationHolder());
+        this(bufferPool, new Configuration.ConfigurationCustomizer());
     }
 
     public Parser(ByteBufferPool bufferPool, Configuration configuration)