diff --git a/jetty-server/src/main/java/org/eclipse/jetty/server/HttpChannelState.java b/jetty-server/src/main/java/org/eclipse/jetty/server/HttpChannelState.java
index 53e302d63113..bf3027591200 100644
--- a/jetty-server/src/main/java/org/eclipse/jetty/server/HttpChannelState.java
+++ b/jetty-server/src/main/java/org/eclipse/jetty/server/HttpChannelState.java
@@ -968,6 +968,9 @@ protected void completed()
             }
         }
 
+        // release any aggregate buffer from a closing flush
+        _channel.getResponse().getHttpOutput().closed();
+
         if (event != null)
         {
             cancelTimeout(event);