diff --git a/lib/include/srsran/rlc/rlc_am_nr.h b/lib/include/srsran/rlc/rlc_am_nr.h
index 42bf858d7..427b75ffa 100644
--- a/lib/include/srsran/rlc/rlc_am_nr.h
+++ b/lib/include/srsran/rlc/rlc_am_nr.h
@@ -240,8 +240,8 @@ public:
   // Data handling methods
   int  handle_full_data_sdu(const rlc_am_nr_pdu_header_t& header, const uint8_t* payload, uint32_t nof_bytes);
   int  handle_segment_data_sdu(const rlc_am_nr_pdu_header_t& header, const uint8_t* payload, uint32_t nof_bytes);
-  bool inside_rx_window(uint32_t sn);
-  bool valid_ack_sn(uint32_t sn);
+  bool inside_rx_window(uint32_t sn) const;
+  bool valid_ack_sn(uint32_t sn) const;
   void write_to_upper_layers(uint32_t lcid, unique_byte_buffer_t sdu);
   void insert_received_segment(rlc_amd_rx_pdu_nr segment, rlc_amd_rx_sdu_nr_t::segment_list_t& segment_list) const;
   /**
diff --git a/lib/src/rlc/rlc_am_nr.cc b/lib/src/rlc/rlc_am_nr.cc
index 5cf175917..4607e72b8 100644
--- a/lib/src/rlc/rlc_am_nr.cc
+++ b/lib/src/rlc/rlc_am_nr.cc
@@ -787,7 +787,7 @@ void rlc_am_nr_tx::handle_control_pdu(uint8_t* payload, uint32_t nof_bytes)
    * Checking if the ACK_SN is inside the the TX_WINDOW makes sure we discard out of order status reports
    * Checking if ACK_SN > Tx_Next makes sure we do not receive a ACK/NACK for something we did not TX
    */
-  if (not inside_tx_window(status.ack_sn)) {
+  if (not valid_ack_sn(status.ack_sn)) {
     RlcInfo("Received ACK with SN outside of TX_WINDOW, ignoring status report. ACK_SN=%d, TX_NEXT_ACK=%d.",
             status.ack_sn,
             st.tx_next_ack);
@@ -1309,7 +1309,7 @@ bool rlc_am_nr_tx::inside_tx_window(uint32_t sn) const
   return tx_mod_base_nr(sn) < tx_window_size();
 }
 
-bool rlc_am_nr_tx::valid_ack_sn(uint32_t sn)
+bool rlc_am_nr_tx::valid_ack_sn(uint32_t sn) const
 {
   // Tx_Next_Ack < SN <= TX_Next + AM_Window_Size
   return (0 < tx_mod_base_nr(sn)) && (tx_mod_base_nr(sn) <= tx_window_size());
@@ -1943,13 +1943,13 @@ uint32_t rlc_am_nr_rx::rx_window_size() const
   return am_window_size(cfg.rx_sn_field_length);
 }
 
-bool rlc_am_nr_rx::inside_rx_window(uint32_t sn)
+bool rlc_am_nr_rx::inside_rx_window(uint32_t sn) const
 {
   // RX_Next <= SN < RX_Next + AM_Window_Size
   return rx_mod_base_nr(sn) < rx_window_size();
 }
 
-bool rlc_am_nr_rx::valid_ack_sn(uint32_t sn)
+bool rlc_am_nr_rx::valid_ack_sn(uint32_t sn) const
 {
   // RX_Next < SN <= RX_Next + AM_Window_Size
   return (0 < rx_mod_base_nr(sn)) && (rx_mod_base_nr(sn) <= rx_window_size());
diff --git a/lib/test/rlc/rlc_am_nr_test.cc b/lib/test/rlc/rlc_am_nr_test.cc
index ef114bf8d..330ea59fb 100644
--- a/lib/test/rlc/rlc_am_nr_test.cc
+++ b/lib/test/rlc/rlc_am_nr_test.cc
@@ -3175,6 +3175,12 @@ int full_rx_window_t_reassembly_expiry(rlc_am_nr_sn_size_t sn_size)
     timers.step_all();
   }
 
+  // Check Rx_Status_Highest
+  {
+    rlc_am_nr_rx_state_t st = rx2->get_rx_state();
+    TESTASSERT_EQ(2048, st.rx_highest_status);
+  }
+
   return SRSRAN_SUCCESS;
 }