diff --git a/src/algorithms/signal_source/adapters/rtl_tcp_signal_source.cc b/src/algorithms/signal_source/adapters/rtl_tcp_signal_source.cc
index 2ebcc3445..5788b61b9 100644
--- a/src/algorithms/signal_source/adapters/rtl_tcp_signal_source.cc
+++ b/src/algorithms/signal_source/adapters/rtl_tcp_signal_source.cc
@@ -183,7 +183,7 @@ void RtlTcpSignalSource::disconnect(gr::top_block_sptr top_block)
 gr::basic_block_sptr RtlTcpSignalSource::get_left_block()
 {
     LOG(WARNING) << "Trying to get signal source left block.";
-    return gr::basic_block_sptr();
+    return {};
 }
 
 
diff --git a/src/algorithms/signal_source/gnuradio_blocks/labsat23_source.cc b/src/algorithms/signal_source/gnuradio_blocks/labsat23_source.cc
index 13064906b..ddd2cc000 100644
--- a/src/algorithms/signal_source/gnuradio_blocks/labsat23_source.cc
+++ b/src/algorithms/signal_source/gnuradio_blocks/labsat23_source.cc
@@ -115,7 +115,7 @@ std::string labsat23_source::generate_filename()
                 {
                     return d_signal_file_basename;
                 }
-            return std::string("donotexist");  // just to stop processing
+            return {"donotexist"};  // just to stop processing
         }
     if (d_signal_file_basename.substr(d_signal_file_basename.length() - 5, 5) == ".ls3w" or d_signal_file_basename.substr(d_signal_file_basename.length() - 5, 5) == ".LS3W")
         {