diff --git a/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/AsyncHTTPConduit.java b/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/AsyncHTTPConduit.java
index 2181e67dccb..a773347bd84 100644
--- a/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/AsyncHTTPConduit.java
+++ b/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/AsyncHTTPConduit.java
@@ -313,7 +313,7 @@ public AsyncWrappedOutputStream(Message message, boolean needToCacheRequest, boo
             basicEntity = (MutableHttpEntity)entity.getEntity();
             basicEntity.setChunked(isChunking);
             
-            final int bufSize = csPolicy.getChunkLength() > 0 ? csPolicy.getChunkLength() : 16320;
+            final int bufSize = csPolicy.getChunkLength() > 0 ? csPolicy.getChunkLength() : 32 * 1024;
             inbuf = new SharedInputBuffer(bufSize);
             outbuf = new SharedOutputBuffer(bufSize);
             isAsync = outMessage != null && outMessage.getExchange() != null
diff --git a/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/AsyncHTTPConduitFactory.java b/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/AsyncHTTPConduitFactory.java
index 63f9eb0a62c..1a69cc562a0 100644
--- a/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/AsyncHTTPConduitFactory.java
+++ b/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/AsyncHTTPConduitFactory.java
@@ -159,7 +159,7 @@ public PoolingAsyncClientConnectionManager getConnectionManager() {
     private int soTimeout = IOReactorConfig.DEFAULT.getSoTimeout().toMillisecondsIntBound();
     private boolean soKeepalive = IOReactorConfig.DEFAULT.isSoKeepAlive();
     private boolean tcpNoDelay = true;
-    private int bufferSize = 16 * 1024;
+    private int bufferSize = 32 * 1024; // Http1Config::INIT_BUF_SIZE
 
     AsyncHTTPConduitFactory() {
         super();
diff --git a/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/URLConnectionAsyncHTTPConduit.java b/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/URLConnectionAsyncHTTPConduit.java
index d6767317402..71d1539dbfe 100644
--- a/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/URLConnectionAsyncHTTPConduit.java
+++ b/rt/transports/http-hc5/src/main/java/org/apache/cxf/transport/http/asyncclient/hc5/URLConnectionAsyncHTTPConduit.java
@@ -310,7 +310,7 @@ public AsyncWrappedOutputStream(Message message, boolean needToCacheRequest, boo
             basicEntity = (MutableHttpEntity)entity.getEntity();
             basicEntity.setChunked(isChunking);
             
-            final int bufSize = csPolicy.getChunkLength() > 0 ? csPolicy.getChunkLength() : 16320;
+            final int bufSize = csPolicy.getChunkLength() > 0 ? csPolicy.getChunkLength() : 32 * 1024;
             inbuf = new SharedInputBuffer(bufSize);
             outbuf = new SharedOutputBuffer(bufSize);
             isAsync = outMessage != null && outMessage.getExchange() != null
@@ -885,7 +885,7 @@ protected void setupNewConnection(String newURL) throws IOException {
             sslURL = null;
 
             //reset the buffers
-            int bufSize = csPolicy.getChunkLength() > 0 ? csPolicy.getChunkLength() : 16320;
+            int bufSize = csPolicy.getChunkLength() > 0 ? csPolicy.getChunkLength() : 32 * 1024;
             inbuf = new SharedInputBuffer(bufSize);
             outbuf = new SharedOutputBuffer(bufSize);
             try {