diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 2eab22ce5c..1cd15542eb 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,11 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2011-03-29 08:05 UTC+0200 Przemyslaw Czerpak (druzus/at/priv.onet.pl)
+  * harbour/src/rtl/hbznet.c
+    % use Z_PARTIAL_FLUSH instead of Z_SYNC_FLUSH in hb_znetFlush()
+      It should reduce a little bit the size of compressed data stream.
+
 2011-03-28 12:13 UTC+0200 Viktor Szakats (harbour.01 syenar.hu)
   * contrib/hbgs/core.c
     ! Fixed C++ warning.
diff --git a/harbour/src/rtl/hbznet.c b/harbour/src/rtl/hbznet.c
index 6aa69dcaaa..7f8187f359 100644
--- a/harbour/src/rtl/hbznet.c
+++ b/harbour/src/rtl/hbznet.c
@@ -367,7 +367,7 @@ long hb_znetFlush( PHB_ZNETSTREAM pStream, HB_SOCKET sd, HB_MAXINT timeout )
    uInt uiSize = HB_ZNET_BUFSIZE - ( pStream->crypt ? 2 : 0 );
 
    if( pStream->wr.avail_out > 0 )
-      pStream->err = deflate( &pStream->wr, Z_SYNC_FLUSH );
+      pStream->err = deflate( &pStream->wr, Z_PARTIAL_FLUSH );
    else
       pStream->err = Z_OK;
 
@@ -377,7 +377,7 @@ long hb_znetFlush( PHB_ZNETSTREAM pStream, HB_SOCKET sd, HB_MAXINT timeout )
          break;
 
       if( pStream->err == Z_OK )
-         pStream->err = deflate( &pStream->wr, Z_SYNC_FLUSH );
+         pStream->err = deflate( &pStream->wr, Z_PARTIAL_FLUSH );
    }
 
    return uiSize - pStream->wr.avail_out;