diff --git a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.cc b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.cc
index 90a209fa5..2fd99ae09 100644
--- a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.cc
+++ b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.cc
@@ -62,9 +62,8 @@ gps_l1_ca_telemetry_decoder_gs::gps_l1_ca_telemetry_decoder_gs(
     bool dump) : gr::block("gps_navigation_gs", gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)),
                      gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)))
 {
-    this->set_max_output_buffer(128);
-    LOG(INFO) << "current tlm output buffer set to " << this->max_output_buffer(0);
-    std::cout << "current tlm output buffer set to " << this->max_output_buffer(0) << "\n";
+    //this->set_max_output_buffer(128);
+    this->set_max_noutput_items(1);
 
     // Ephemeris data port out
     this->message_port_register_out(pmt::mp("telemetry"));
diff --git a/src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.cc b/src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.cc
index 6ec7ccf02..7450782b4 100644
--- a/src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.cc
+++ b/src/algorithms/tracking/gnuradio_blocks/dll_pll_veml_tracking.cc
@@ -92,9 +92,7 @@ dll_pll_veml_tracking_sptr dll_pll_veml_make_tracking(const Dll_Pll_Conf &conf_)
 dll_pll_veml_tracking::dll_pll_veml_tracking(const Dll_Pll_Conf &conf_) : gr::block("dll_pll_veml_tracking", gr::io_signature::make(1, 1, sizeof(gr_complex)),
                                                                               gr::io_signature::make(1, 1, sizeof(Gnss_Synchro)))
 {
-    this->set_max_output_buffer(128);
-    LOG(INFO) << "current tracking output buffer set to " << this->max_output_buffer(0);
-    std::cout << "current tracking output buffer set to " << this->max_output_buffer(0) << "\n";
+    this->set_max_noutput_items(1);
     trk_parameters = conf_;
     // Telemetry bit synchronization message port input
     this->message_port_register_out(pmt::mp("events"));