diff --git a/jetty-core/jetty-client/src/test/java/org/eclipse/jetty/client/ssl/SslConnectionTest.java b/jetty-core/jetty-client/src/test/java/org/eclipse/jetty/client/ssl/SslConnectionTest.java
index dae684b80d91..df8c0f870884 100644
--- a/jetty-core/jetty-client/src/test/java/org/eclipse/jetty/client/ssl/SslConnectionTest.java
+++ b/jetty-core/jetty-client/src/test/java/org/eclipse/jetty/client/ssl/SslConnectionTest.java
@@ -62,7 +62,7 @@ public void onFillable()
         // There are no bytes in the endPoint, so we fill zero.
         // However, this will trigger state changes in SSLEngine
         // that will later cause it to throw ISE("Internal error").
-        sslEndPoint.fill(BufferUtil.EMPTY_BUFFER);
+        sslEndPoint.fill(BufferUtil.EMPTY_WRITABLE_BUFFER);
 
         // Close the connection before filling.
         sslEndPoint.shutdownOutput();
@@ -76,6 +76,6 @@ public void onFillable()
         // We want SSLHandshakeException to be thrown instead, because it is
         // handled better (it is an IOException) by the Connection code that
         // reads from the EndPoint.
-        assertThrows(SSLHandshakeException.class, () -> sslEndPoint.fill(BufferUtil.EMPTY_BUFFER));
+        assertThrows(SSLHandshakeException.class, () -> sslEndPoint.fill(BufferUtil.EMPTY_WRITABLE_BUFFER));
     }
 }
diff --git a/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/NegotiatingClientConnection.java b/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/NegotiatingClientConnection.java
index 1d35e7cb1328..36cf67c75382 100644
--- a/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/NegotiatingClientConnection.java
+++ b/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/NegotiatingClientConnection.java
@@ -14,7 +14,6 @@
 package org.eclipse.jetty.io;
 
 import java.io.IOException;
-import java.nio.ByteBuffer;
 import java.util.Map;
 import java.util.concurrent.Executor;
 import javax.net.ssl.SSLEngine;
@@ -26,7 +25,6 @@
 public abstract class NegotiatingClientConnection extends AbstractConnection
 {
     private static final Logger LOG = LoggerFactory.getLogger(NegotiatingClientConnection.class);
-    private static final ByteBuffer EMPTY_WRITABLE_BUFFER = ByteBuffer.allocate(0);
 
     private final SSLEngine engine;
     private final ClientConnectionFactory connectionFactory;
@@ -101,7 +99,7 @@ private int fill()
     {
         try
         {
-            return getEndPoint().fill(EMPTY_WRITABLE_BUFFER);
+            return getEndPoint().fill(BufferUtil.EMPTY_WRITABLE_BUFFER);
         }
         catch (IOException x)
         {
diff --git a/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/ssl/SslConnection.java b/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/ssl/SslConnection.java
index 39f74d7dde11..60cad8e9dbfd 100644
--- a/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/ssl/SslConnection.java
+++ b/jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/ssl/SslConnection.java
@@ -580,7 +580,7 @@ protected void onFillable()
                         waitingForFill = _flushState == FlushState.WAIT_FOR_FILL;
                     }
                     if (waitingForFill)
-                        fill(BufferUtil.EMPTY_BUFFER);
+                        fill(BufferUtil.EMPTY_WRITABLE_BUFFER);
                 }
             }
             catch (Throwable e)
@@ -1080,7 +1080,7 @@ public boolean flush(ByteBuffer... appOuts) throws IOException
                                         break;
                                     if (_fillState == FillState.IDLE)
                                     {
-                                        int filled = fill(BufferUtil.EMPTY_BUFFER);
+                                        int filled = fill(BufferUtil.EMPTY_WRITABLE_BUFFER);
                                         if (_sslEngine.getHandshakeStatus() != status)
                                             continue;
                                         if (filled < 0)
@@ -1270,7 +1270,7 @@ protected void onIncompleteFlush()
                                 // Try filling ourselves
                                 try
                                 {
-                                    int filled = fill(BufferUtil.EMPTY_BUFFER);
+                                    int filled = fill(BufferUtil.EMPTY_WRITABLE_BUFFER);
                                     // If this changed the status, let's try again
                                     if (_sslEngine.getHandshakeStatus() != status)
                                         continue;
diff --git a/jetty-core/jetty-quic/jetty-quic-common/src/main/java/org/eclipse/jetty/quic/common/QuicStreamEndPoint.java b/jetty-core/jetty-quic/jetty-quic-common/src/main/java/org/eclipse/jetty/quic/common/QuicStreamEndPoint.java
index 227af953034c..7986d4b2a6b1 100644
--- a/jetty-core/jetty-quic/jetty-quic-common/src/main/java/org/eclipse/jetty/quic/common/QuicStreamEndPoint.java
+++ b/jetty-core/jetty-quic/jetty-quic-common/src/main/java/org/eclipse/jetty/quic/common/QuicStreamEndPoint.java
@@ -42,7 +42,6 @@ public class QuicStreamEndPoint extends AbstractEndPoint
 {
     private static final Logger LOG = LoggerFactory.getLogger(QuicStreamEndPoint.class);
     private static final ByteBuffer LAST_FLAG = ByteBuffer.allocate(0);
-    private static final ByteBuffer EMPTY_WRITABLE_BUFFER = ByteBuffer.allocate(0);
 
     private final QuicSession session;
     private final long streamId;
@@ -272,7 +271,7 @@ public boolean onReadable()
                 // Check if the stream was finished normally.
                 try
                 {
-                    fill(EMPTY_WRITABLE_BUFFER);
+                    fill(BufferUtil.EMPTY_WRITABLE_BUFFER);
                 }
                 catch (EOFException x)
                 {
diff --git a/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/NegotiatingServerConnection.java b/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/NegotiatingServerConnection.java
index 038e02d48c35..3292ce948f37 100644
--- a/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/NegotiatingServerConnection.java
+++ b/jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/NegotiatingServerConnection.java
@@ -14,7 +14,6 @@
 package org.eclipse.jetty.server;
 
 import java.io.IOException;
-import java.nio.ByteBuffer;
 import java.util.List;
 import javax.net.ssl.SSLEngine;
 import javax.net.ssl.SSLEngineResult;
@@ -22,13 +21,13 @@
 import org.eclipse.jetty.io.AbstractConnection;
 import org.eclipse.jetty.io.Connection;
 import org.eclipse.jetty.io.EndPoint;
+import org.eclipse.jetty.util.BufferUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 public abstract class NegotiatingServerConnection extends AbstractConnection
 {
     private static final Logger LOG = LoggerFactory.getLogger(NegotiatingServerConnection.class);
-    private static final ByteBuffer EMPTY_WRITABLE_BUFFER = ByteBuffer.allocate(0);
 
     public interface CipherDiscriminator
     {
@@ -145,7 +144,7 @@ private int fill()
     {
         try
         {
-            return getEndPoint().fill(EMPTY_WRITABLE_BUFFER);
+            return getEndPoint().fill(BufferUtil.EMPTY_WRITABLE_BUFFER);
         }
         catch (IOException x)
         {
diff --git a/jetty-core/jetty-util/src/main/java/org/eclipse/jetty/util/BufferUtil.java b/jetty-core/jetty-util/src/main/java/org/eclipse/jetty/util/BufferUtil.java
index 82d39988bcd4..96f61e524826 100644
--- a/jetty-core/jetty-util/src/main/java/org/eclipse/jetty/util/BufferUtil.java
+++ b/jetty-core/jetty-util/src/main/java/org/eclipse/jetty/util/BufferUtil.java
@@ -107,7 +107,8 @@ public class BufferUtil
         };
 
     public static final byte[] EMPTY_BYTES = new byte[0];
-    public static final ByteBuffer EMPTY_BUFFER = ByteBuffer.wrap(EMPTY_BYTES).asReadOnlyBuffer();
+    public static final ByteBuffer EMPTY_WRITABLE_BUFFER = ByteBuffer.wrap(EMPTY_BYTES);
+    public static final ByteBuffer EMPTY_BUFFER = EMPTY_WRITABLE_BUFFER.asReadOnlyBuffer();
 
     /**
      * Allocate ByteBuffer in flush mode.