diff --git a/lib/include/srslte/upper/rlc_um_base.h b/lib/include/srslte/upper/rlc_um_base.h
index 5d35b00e7..fd5f64371 100644
--- a/lib/include/srslte/upper/rlc_um_base.h
+++ b/lib/include/srslte/upper/rlc_um_base.h
@@ -13,6 +13,7 @@
 #ifndef SRSLTE_RLC_UM_BASE_H
 #define SRSLTE_RLC_UM_BASE_H
 
+#include "srslte/adt/accumulators.h"
 #include "srslte/common/buffer_pool.h"
 #include "srslte/common/common.h"
 #include "srslte/common/log.h"
@@ -84,6 +85,7 @@ protected:
     byte_buffer_pool* pool = nullptr;
     srslte::log_ref   log;
     std::string       rb_name;
+    rlc_um_base*      parent = nullptr;
 
     rlc_config_t cfg = {};
 
@@ -94,6 +96,11 @@ protected:
     // Mutexes
     std::mutex mutex;
 
+    // Metrics
+#ifdef ENABLE_TIMESTAMP
+    srslte::rolling_average<double> mean_pdu_latency_us;
+#endif
+
     virtual int build_data_pdu(unique_byte_buffer_t pdu, uint8_t* payload, uint32_t nof_bytes) = 0;
 
     // helper functions
diff --git a/lib/include/srslte/upper/rlc_um_lte.h b/lib/include/srslte/upper/rlc_um_lte.h
index 205bda235..7016e163d 100644
--- a/lib/include/srslte/upper/rlc_um_lte.h
+++ b/lib/include/srslte/upper/rlc_um_lte.h
@@ -13,7 +13,6 @@
 #ifndef SRSLTE_RLC_UM_LTE_H
 #define SRSLTE_RLC_UM_LTE_H
 
-#include "srslte/adt/accumulators.h"
 #include "srslte/common/buffer_pool.h"
 #include "srslte/common/common.h"
 #include "srslte/common/log.h"
@@ -65,9 +64,6 @@ private:
     uint32_t vt_us = 0; // Send state. SN to be assigned for next PDU.
 
     // Metrics
-#ifdef ENABLE_TIMESTAMP
-    srslte::rolling_average<double> mean_pdu_latency_us;
-#endif
     void debug_state();
   };
 
diff --git a/lib/src/upper/rlc_um_base.cc b/lib/src/upper/rlc_um_base.cc
index 5f85fa5a3..02b14e38c 100644
--- a/lib/src/upper/rlc_um_base.cc
+++ b/lib/src/upper/rlc_um_base.cc
@@ -20,12 +20,7 @@ rlc_um_base::rlc_um_base(srslte::log_ref            log_,
                          srsue::pdcp_interface_rlc* pdcp_,
                          srsue::rrc_interface_rlc*  rrc_,
                          srslte::timer_handler*     timers_) :
-  log(log_),
-  lcid(lcid_),
-  pdcp(pdcp_),
-  rrc(rrc_),
-  timers(timers_),
-  pool(byte_buffer_pool::get_instance())
+  log(log_), lcid(lcid_), pdcp(pdcp_), rrc(rrc_), timers(timers_), pool(byte_buffer_pool::get_instance())
 {}
 
 rlc_um_base::~rlc_um_base() {}
@@ -202,7 +197,9 @@ rlc_um_base::rlc_um_base_rx::~rlc_um_base_rx() {}
  * Tx subclass implementation (base)
  ***************************************************************************/
 
-rlc_um_base::rlc_um_base_tx::rlc_um_base_tx(rlc_um_base* parent_) : log(parent_->log), pool(parent_->pool) {}
+rlc_um_base::rlc_um_base_tx::rlc_um_base_tx(rlc_um_base* parent_) :
+  log(parent_->log), pool(parent_->pool), parent(parent_)
+{}
 
 rlc_um_base::rlc_um_base_tx::~rlc_um_base_tx() {}
 
@@ -303,7 +300,11 @@ int rlc_um_base::rlc_um_base_tx::build_data_pdu(uint8_t* payload, uint32_t nof_b
       return 0;
     }
   }
-  return build_data_pdu(std::move(pdu), payload, nof_bytes);
+  int len = build_data_pdu(std::move(pdu), payload, nof_bytes);
+  if (len > 0) {
+    parent->metrics.sdu_tx_latency_us = mean_pdu_latency_us.value();
+  }
+  return len;
 }
 
 } // namespace srslte