diff --git a/kernel/trunk/network/socket.inc b/kernel/trunk/network/socket.inc
index d9238082c2..619e56f233 100644
--- a/kernel/trunk/network/socket.inc
+++ b/kernel/trunk/network/socket.inc
@@ -1,6 +1,6 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;                                                                 ;;
-;; Copyright (C) KolibriOS team 2004-2016. All rights reserved.    ;;
+;; Copyright (C) KolibriOS team 2004-2017. All rights reserved.    ;;
 ;; Distributed under terms of the GNU General Public License       ;;
 ;;                                                                 ;;
 ;;  Part of the TCP/IP network stack for KolibriOS                 ;;
@@ -63,7 +63,6 @@ struct  TCP_SOCKET              IP_SOCKET
         t_rxtcur                dd ?
         t_dupacks               dd ?
         t_maxseg                dd ?
-        t_force                 dd ?
         t_flags                 dd ?
 
 ;---------------
diff --git a/kernel/trunk/network/tcp.inc b/kernel/trunk/network/tcp.inc
index a5da1d22c2..cdf5f54de7 100644
--- a/kernel/trunk/network/tcp.inc
+++ b/kernel/trunk/network/tcp.inc
@@ -1,6 +1,6 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;                                                                 ;;
-;; Copyright (C) KolibriOS team 2004-2016. All rights reserved.    ;;
+;; Copyright (C) KolibriOS team 2004-2017. All rights reserved.    ;;
 ;; Distributed under terms of the GNU General Public License       ;;
 ;;                                                                 ;;
 ;;  Part of the TCP/IP network stack for KolibriOS                 ;;
@@ -41,6 +41,8 @@ TF_REQ_TSTMP            = 1 shl 7     ; have/will request timestamps
 TF_RCVD_TSTMP           = 1 shl 8     ; a timestamp was received in SYN
 TF_SACK_PERMIT          = 1 shl 9     ; other side said I could SACK
 
+TF_FORCE                = 1 shl 16    ; force to send a segment
+
 ; Segment flags
 TH_FIN                  = 1 shl 0
 TH_SYN                  = 1 shl 1
diff --git a/kernel/trunk/network/tcp_output.inc b/kernel/trunk/network/tcp_output.inc
index 7a5332aa96..259ace8280 100644
--- a/kernel/trunk/network/tcp_output.inc
+++ b/kernel/trunk/network/tcp_output.inc
@@ -90,8 +90,8 @@ endl
 ; Otherwise, if window is small but nonzero, and timer expired,
 ; we will send what we can and go to transmit state
 
-        cmp     [eax + TCP_SOCKET.t_force], 0
-        je      .no_force
+        test    [eax + TCP_SOCKET.t_flags], TF_FORCE
+        jz      .no_force
 
         DEBUGF  DEBUG_NETWORK_VERBOSE, "TCP_output: forcing data out\n"
 
@@ -200,7 +200,7 @@ endl
         je      .send
        @@:
 
-        test    [eax + TCP_SOCKET.t_force], -1  ;;;
+        test    [eax + TCP_SOCKET.t_flags], TF_FORCE
         jnz     .send
 
         mov     ebx, [eax + TCP_SOCKET.max_sndwnd]
@@ -424,8 +424,8 @@ endl
         test    esi, esi
         jz      .zero_data
 
-        cmp     [eax + TCP_SOCKET.t_force], 1
-        jne     @f
+        test    [eax + TCP_SOCKET.t_flags], TF_FORCE
+        jz      @f
         cmp     esi, 1
         jne     @f
         inc     [TCPS_sndprobe]
diff --git a/kernel/trunk/network/tcp_timer.inc b/kernel/trunk/network/tcp_timer.inc
index 850af138d0..8f19dd10ce 100644
--- a/kernel/trunk/network/tcp_timer.inc
+++ b/kernel/trunk/network/tcp_timer.inc
@@ -1,6 +1,6 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;                                                                 ;;
-;; Copyright (C) KolibriOS team 2004-2015. All rights reserved.    ;;
+;; Copyright (C) KolibriOS team 2004-2017. All rights reserved.    ;;
 ;; Distributed under terms of the GNU General Public License       ;;
 ;;                                                                 ;;
 ;;  Part of the TCP/IP network stack for KolibriOS                 ;;
@@ -151,11 +151,11 @@ proc tcp_timer_640ms
         DEBUGF  DEBUG_NETWORK_VERBOSE, "socket %x: persist timer expired\n", eax
 
         call    tcp_set_persist
-        mov     [eax + TCP_SOCKET.t_force], 1
+        or      [eax + TCP_SOCKET.t_flags], TF_FORCE
         push    eax
         call    tcp_output
         pop     eax
-        mov     [eax + TCP_SOCKET.t_force], 0
+        and     [eax + TCP_SOCKET.t_flags], not TF_FORCE
 
   .check_more6:
         test    [eax + TCP_SOCKET.timer_flags], timer_flag_wait