diff --git a/src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc b/src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc
index 3b9bda966..a2dc8b7d0 100644
--- a/src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc
+++ b/src/algorithms/telemetry_decoder/gnuradio_blocks/galileo_telemetry_decoder_gs.cc
@@ -607,6 +607,7 @@ int galileo_telemetry_decoder_gs::general_work(int noutput_items __attribute__((
             }
         default:
             {
+                LOG(WARNING) << "Frame type " << d_frame_type << " is not defined";
                 d_symbol_history.push_back(current_symbol.Prompt_I);
                 break;
             }