diff --git a/examples/platforms/nrf52840/radio.c b/examples/platforms/nrf52840/radio.c
index c40cd137a..78ed76541 100644
--- a/examples/platforms/nrf52840/radio.c
+++ b/examples/platforms/nrf52840/radio.c
@@ -63,6 +63,7 @@
 
 #define SHORT_ADDRESS_SIZE    2
 #define EXTENDED_ADDRESS_SIZE 8
+#define PENDING_BIT           0x10
 
 enum
 {
@@ -75,7 +76,7 @@ static RadioPacket sReceivedFrames[RADIO_RX_BUFFERS];
 static RadioPacket sTransmitFrame;
 static uint8_t     sTransmitPsdu[kMaxPHYPacketSize + 1]
 __attribute__((section("nrf_radio_buffer.sTransmiPsdu")));
-static bool        sTransmitPendingBit;
+static uint8_t    *sAckPsdu;
 
 static uint32_t    sEnergyDetectionTime;
 static uint8_t     sEnergyDetectionChannel;
@@ -102,6 +103,8 @@ static void dataInit(void)
     {
         sReceivedFrames[i].mPsdu = NULL;
     }
+
+    sAckPsdu = NULL;
 }
 
 static void convertShortAddress(uint8_t *aTo, uint16_t aFrom)
@@ -515,16 +518,24 @@ void nrf5RadioProcess(otInstance *aInstance)
 
     if (isPendingEventSet(kPendingEventFrameTransmitted))
     {
+        bool pendingBit = ((sAckPsdu != NULL) && (sAckPsdu[1] & PENDING_BIT)) ? true : false;
+
 #if OPENTHREAD_ENABLE_DIAG
 
         if (otPlatDiagModeGet())
         {
-            otPlatDiagRadioTransmitDone(aInstance, &sTransmitFrame, sTransmitPendingBit, OT_ERROR_NONE);
+            otPlatDiagRadioTransmitDone(aInstance, &sTransmitFrame, pendingBit, OT_ERROR_NONE);
         }
         else
 #endif
         {
-            otPlatRadioTransmitDone(aInstance, &sTransmitFrame, sTransmitPendingBit, OT_ERROR_NONE);
+            otPlatRadioTransmitDone(aInstance, &sTransmitFrame, pendingBit, OT_ERROR_NONE);
+        }
+
+        if (sAckPsdu != NULL)
+        {
+            nrf_drv_radio802154_buffer_free(sAckPsdu);
+            sAckPsdu = NULL;
         }
 
         resetPendingEvent(kPendingEventFrameTransmitted);
@@ -595,9 +606,9 @@ void nrf_drv_radio802154_received(uint8_t *p_data, int8_t power, int8_t lqi)
     receivedFrame->mChannel = nrf_drv_radio802154_channel_get();
 }
 
-void nrf_drv_radio802154_transmitted(bool pending_bit)
+void nrf_drv_radio802154_transmitted(uint8_t *aAckPsdu)
 {
-    sTransmitPendingBit = pending_bit;
+    sAckPsdu = aAckPsdu;
 
     setPendingEvent(kPendingEventFrameTransmitted);
 }
diff --git a/third_party/NordicSemiconductor/drivers/nrf_drv_radio802154.c b/third_party/NordicSemiconductor/drivers/nrf_drv_radio802154.c
index dbced96cb..ef7d90192 100644
--- a/third_party/NordicSemiconductor/drivers/nrf_drv_radio802154.c
+++ b/third_party/NordicSemiconductor/drivers/nrf_drv_radio802154.c
@@ -1439,7 +1439,7 @@ void RADIO_IRQHandler(void)
 
             if (!ack_is_requested(mp_tx_data))
             {
-                nrf_drv_radio802154_transmitted(false);
+                nrf_drv_radio802154_transmitted(NULL);
 
                 state_set(RADIO_STATE_WAITING_RX_FRAME);
             }
@@ -1463,8 +1463,8 @@ void RADIO_IRQHandler(void)
             if ((nrf_radio_event_get(NRF_RADIO_EVENT_MHRMATCH)) &&
                 (nrf_radio_crc_status_get() == NRF_RADIO_CRC_STATUS_OK))
             {
-                nrf_drv_radio802154_transmitted(
-                        (mp_current_rx_buffer->psdu[FRAME_PENDING_OFFSET] & FRAME_PENDING_BIT) != 0);
+                mp_current_rx_buffer->free = false;
+                nrf_drv_radio802154_transmitted(mp_current_rx_buffer->psdu);
 
                 nrf_radio_mhmu_search_pattern_set(0);
                 nrf_radio_event_clear(NRF_RADIO_EVENT_MHRMATCH);
@@ -1679,9 +1679,9 @@ void __attribute__((weak)) nrf_drv_radio802154_received(uint8_t * p_data, int8_t
     (void) lqi;
 }
 
-void __attribute__((weak)) nrf_drv_radio802154_transmitted(bool pending_bit)
+void __attribute__((weak)) nrf_drv_radio802154_transmitted(uint8_t * p_ack)
 {
-    (void) pending_bit;
+    (void) p_ack;
 }
 
 void __attribute__((weak)) nrf_drv_radio802154_busy_channel(void)
diff --git a/third_party/NordicSemiconductor/drivers/nrf_drv_radio802154.h b/third_party/NordicSemiconductor/drivers/nrf_drv_radio802154.h
index 8e0ec86b6..6282ca7ae 100644
--- a/third_party/NordicSemiconductor/drivers/nrf_drv_radio802154.h
+++ b/third_party/NordicSemiconductor/drivers/nrf_drv_radio802154.h
@@ -224,12 +224,17 @@ void nrf_drv_radio802154_received(uint8_t * p_data, int8_t power, int8_t lqi);
  * @brief Notify that frame was transmitted.
  *
  * @note If ACK was requested for transmitted frame this function is called after proper ACK is
- *       received. If ACK was not requested this function is called just after transmission is
- *       ended.
+ *       received. If ACK was not requested this function is called just after transmission ends.
+ * @note Buffer pointed by the p_ack pointer is not modified by the radio driver (and can't
+ *       be used to receive a frame) until nrf_drv_radio802154_buffer_free() function is called.
+ * @note Buffer pointed by the p_ack pointer may be modified by the function handler (and other
+ *       modules) until nrf_drv_radio802154_buffer_free() function is called.
  *
- * @param[in]  pending_bit  Value of pending bit in received ACK or false if ACK was not requested.
+ * @param[in]  p_ack  Pointer to received ACK buffer. The first byte in the buffer is length of the
+ *                    frame and following bytes are the ACK frame itself (after PHR).
+ *                    If ACK was not requested @p p_ack is set to NULL.
  */
-void nrf_drv_radio802154_transmitted(bool pending_bit);
+void nrf_drv_radio802154_transmitted(uint8_t * p_ack);
 
 /**
  * @brief Notify that frame was not transmitted due to busy channel.