diff --git a/src/core/monitor/gnss_synchro_monitor.cc b/src/core/monitor/gnss_synchro_monitor.cc
index 0454c19eb..f8997d6a3 100644
--- a/src/core/monitor/gnss_synchro_monitor.cc
+++ b/src/core/monitor/gnss_synchro_monitor.cc
@@ -45,19 +45,19 @@ using google::LogMessage;
 gnss_synchro_monitor_sptr gnss_synchro_make_monitor(unsigned int n_channels,
     int output_rate_ms,
     int udp_port,
-    std::vector<std::string> udp_addresses)
+    const std::vector<std::string>& udp_addresses)
 {
     return gnss_synchro_monitor_sptr(new gnss_synchro_monitor(n_channels,
         output_rate_ms,
         udp_port,
-        std::move(udp_addresses)));
+        udp_addresses));
 }
 
 
 gnss_synchro_monitor::gnss_synchro_monitor(unsigned int n_channels,
     int output_rate_ms,
     int udp_port,
-    std::vector<std::string> udp_addresses) : gr::sync_block("gnss_synchro_monitor",
+    const std::vector<std::string>& udp_addresses) : gr::sync_block("gnss_synchro_monitor",
                                                   gr::io_signature::make(n_channels, n_channels, sizeof(Gnss_Synchro)),
                                                   gr::io_signature::make(0, 0, 0))
 {
diff --git a/src/core/monitor/gnss_synchro_monitor.h b/src/core/monitor/gnss_synchro_monitor.h
index 7c22a1290..a0a8e470a 100644
--- a/src/core/monitor/gnss_synchro_monitor.h
+++ b/src/core/monitor/gnss_synchro_monitor.h
@@ -48,7 +48,7 @@ using gnss_synchro_monitor_sptr = boost::shared_ptr<gnss_synchro_monitor>;
 gnss_synchro_monitor_sptr gnss_synchro_make_monitor(unsigned int n_channels,
     int output_rate_ms,
     int udp_port,
-    std::vector<std::string> udp_addresses);
+    const std::vector<std::string>& udp_addresses);
 
 /*!
  * \brief This class implements a block that computes the PVT solution with Galileo E1 signals
@@ -59,7 +59,7 @@ private:
     friend gnss_synchro_monitor_sptr gnss_synchro_make_monitor(unsigned int nchannels,
         int output_rate_ms,
         int udp_port,
-        std::vector<std::string> udp_addresses);
+        const std::vector<std::string>& udp_addresses);
 
     unsigned int d_nchannels;
 
@@ -74,7 +74,7 @@ public:
     gnss_synchro_monitor(unsigned int nchannels,
         int output_rate_ms,
         int udp_port,
-        std::vector<std::string> udp_addresses);
+        const std::vector<std::string>& udp_addresses);
 
     ~gnss_synchro_monitor();  //!< Default destructor