diff --git a/src/algorithms/signal_source/gnuradio_blocks/labsat23_source.cc b/src/algorithms/signal_source/gnuradio_blocks/labsat23_source.cc
index ac7df268c..ff57fa420 100644
--- a/src/algorithms/signal_source/gnuradio_blocks/labsat23_source.cc
+++ b/src/algorithms/signal_source/gnuradio_blocks/labsat23_source.cc
@@ -355,6 +355,8 @@ int labsat23_source::general_work(int noutput_items,
                             auto quantization = static_cast<uint8_t>(memblock[byte_counter]);
                             switch (quantization)
                                 {
+                                case 0:
+                                    break;
                                 case 1:
                                     std::cout << "1 bit per sample" << std::endl;
                                     break;
@@ -393,6 +395,9 @@ int labsat23_source::general_work(int noutput_items,
                                 case 2:
                                     std::cout << "Labsat Channel B is BDS" << std::endl;
                                     break;
+                                case 255:
+                                    // No channel B
+                                    break;
                                 default:
                                     std::cout << "Unknown channel B constellation ID " << static_cast<int>(channel_b_constellation) << std::endl;
                                 }