diff --git a/lib/include/srslte/upper/rlc_um_nr.h b/lib/include/srslte/upper/rlc_um_nr.h
index 576514c58..83ad95191 100644
--- a/lib/include/srslte/upper/rlc_um_nr.h
+++ b/lib/include/srslte/upper/rlc_um_nr.h
@@ -49,7 +49,7 @@ public:
             srsue::rrc_interface_rlc*  rrc_,
             srslte::timer_handler*     timers_);
   ~rlc_um_nr();
-  bool configure(rlc_config_t cnfg);
+  bool configure(const rlc_config_t& cnfg);
 
 private:
   // Transmitter sub-class for NR
@@ -58,7 +58,7 @@ private:
   public:
     rlc_um_nr_tx(rlc_um_base* parent_);
 
-    bool     configure(rlc_config_t cfg, std::string rb_name);
+    bool     configure(const rlc_config_t& cfg, std::string rb_name);
     int      build_data_pdu(unique_byte_buffer_t pdu, uint8_t* payload, uint32_t nof_bytes);
     uint32_t get_buffer_state();
 
diff --git a/lib/src/upper/rlc_um_nr.cc b/lib/src/upper/rlc_um_nr.cc
index 828def67a..45f7ae970 100644
--- a/lib/src/upper/rlc_um_nr.cc
+++ b/lib/src/upper/rlc_um_nr.cc
@@ -40,7 +40,7 @@ rlc_um_nr::~rlc_um_nr()
   stop();
 }
 
-bool rlc_um_nr::configure(rlc_config_t cnfg_)
+bool rlc_um_nr::configure(const rlc_config_t& cnfg_)
 {
   // determine bearer name and configure Rx/Tx objects
   rb_name = get_rb_name(rrc, lcid, cnfg_.um.is_mrb);
@@ -99,7 +99,7 @@ uint32_t rlc_um_nr::rlc_um_nr_tx::get_buffer_state()
   return n_bytes;
 }
 
-bool rlc_um_nr::rlc_um_nr_tx::configure(rlc_config_t cnfg_, std::string rb_name_)
+bool rlc_um_nr::rlc_um_nr_tx::configure(const rlc_config_t& cnfg_, std::string rb_name_)
 {
   cfg = cnfg_;