diff --git a/gr-tnc_nx/lib/tnc_b1_impl.cc b/gr-tnc_nx/lib/tnc_b1_impl.cc
index fee1619..52a5c6b 100644
--- a/gr-tnc_nx/lib/tnc_b1_impl.cc
+++ b/gr-tnc_nx/lib/tnc_b1_impl.cc
@@ -85,7 +85,7 @@ namespace gr {
      * TIMER HANDLER *
      *****************/
     void tnc_b1_impl::handle_timeout(const boost::system::error_code& ec) {
-      if (ec == 0) {
+      if (ec.value() == 0) {
         std::cout << "TM Timeout" << std::endl;
         message_port_pub(pmt::mp("Output"), g.out_ack(SAT_NOK));
         set_idle();
diff --git a/gr-tnc_nx/lib/tnc_impl.cc b/gr-tnc_nx/lib/tnc_impl.cc
index a722006..ad073bd 100644
--- a/gr-tnc_nx/lib/tnc_impl.cc
+++ b/gr-tnc_nx/lib/tnc_impl.cc
@@ -91,7 +91,7 @@ tnc_impl::~tnc_impl() {
  * TIMEOUT HANDLER *
  *******************/
 void tnc_impl::handle_timeout(const boost::system::error_code& ec) {
-  if (ec == 0) {
+  if (ec.value() == 0) {
     switch (p_state) {
 
       case wait_msg: