diff --git a/drivers/wireless/ieee802154/mrf24j40/mrf24j40_radif.c b/drivers/wireless/ieee802154/mrf24j40/mrf24j40_radif.c
index c6f2a431d80..f5b06894f07 100644
--- a/drivers/wireless/ieee802154/mrf24j40/mrf24j40_radif.c
+++ b/drivers/wireless/ieee802154/mrf24j40/mrf24j40_radif.c
@@ -564,6 +564,13 @@ int mrf24j40_getattr(FAR struct ieee802154_radio_s *radio,
         }
         break;
 
+      case IEEE802154_ATTR_PHY_FCS_LEN:
+        {
+          attrval->phy.fcslen = 2;
+          ret = IEEE802154_STATUS_SUCCESS;
+        }
+        break;
+
       default:
         ret = IEEE802154_STATUS_UNSUPPORTED_ATTRIBUTE;
     }
diff --git a/drivers/wireless/ieee802154/xbee/xbee_mac.c b/drivers/wireless/ieee802154/xbee/xbee_mac.c
index a68f65c1bc0..2fa632386d2 100644
--- a/drivers/wireless/ieee802154/xbee/xbee_mac.c
+++ b/drivers/wireless/ieee802154/xbee/xbee_mac.c
@@ -468,7 +468,14 @@ int xbee_req_get(XBEEHANDLE xbee, enum ieee802154_attr_e attr,
         }
         break;
 
-      case IEEE802154_ATTR_RADIO_REGDUMP:
+      case IEEE802154_ATTR_PHY_FCS_LEN:
+        {
+          attrval->phy.fcslen = 2;
+          ret = IEEE802154_STATUS_SUCCESS;
+        }
+        break
+
+      case IEEE802154_ATTR_PHY_REGDUMP:
         {
           xbee_regdump(priv);
         }
diff --git a/include/nuttx/wireless/ieee802154/ieee802154_mac.h b/include/nuttx/wireless/ieee802154/ieee802154_mac.h
index e272a90b24c..08cafb9ee42 100644
--- a/include/nuttx/wireless/ieee802154/ieee802154_mac.h
+++ b/include/nuttx/wireless/ieee802154/ieee802154_mac.h
@@ -358,7 +358,7 @@ enum ieee802154_attr_e
 {
   /* PHY PIB Attributes */
 
-  IEEE802154_ATTR_PHY_CHAN = 0x00,
+  IEEE802154_ATTR_PHY_CHAN,
   IEEE802154_ATTR_PHY_CHANNELS_SUPPORTED,
   IEEE802154_ATTR_PHY_TX_POWER_TOLERANCE,
   IEEE802154_ATTR_PHY_TX_POWER,
@@ -394,11 +394,16 @@ enum ieee802154_attr_e
   IEEE802154_ATTR_PHY_UWB_RX_RMARKER,
   IEEE802154_ATTR_PHY_RFRAME_PROC_TIME,
   IEEE802154_ATTR_PHY_CCA_DURATION,
-  IEEE802154_ATTR_PHY_SYMBOL_DURATION, /* Non-standard attribute */
+
+  /* Non-standard PHY attributes */
+
+  IEEE802154_ATTR_PHY_SYMBOL_DURATION,
+  IEEE802154_ATTR_PHY_FCS_LEN,
+  IEEE802154_ATTR_PHY_REGDUMP,
 
   /* MAC PIB Attributes */
 
-  IEEE802154_ATTR_MAC_EADDR = 0x40,
+  IEEE802154_ATTR_MAC_EADDR,
   IEEE802154_ATTR_MAC_ACK_WAIT_DUR,
   IEEE802154_ATTR_MAC_ASSOCIATED_PANCOORD,
   IEEE802154_ATTR_MAC_ASSOCIATION_PERMIT,
@@ -435,11 +440,10 @@ enum ieee802154_attr_e
   IEEE802154_ATTR_MAC_TX_CTRL_ACTIVE_DUR,
   IEEE802154_ATTR_MAC_TX_CTRL_PAUSE_DUR,
   IEEE802154_ATTR_MAC_TX_TOTAL_DUR,
-  IEEE802154_ATTR_MAC_DEVMODE, /* Non-standard */
 
   /* MAC Security Attributes */
 
-  IEEE802154_ATTR_MAC_KEY_TABLE = 0x70,
+  IEEE802154_ATTR_MAC_KEY_TABLE,
   IEEE802154_ATTR_MAC_DEV_TABLE,
   IEEE802154_ATTR_MAC_SEC_LVL_TABLE,
   IEEE802154_ATTR_MAC_FRAME_COUNTER,
@@ -451,9 +455,9 @@ enum ieee802154_attr_e
   IEEE802154_ATTR_MAC_PANCOORD_EXT_ADDR,
   IEEE802154_ATTR_MAC_PANCOORD_SHORT_ADDR,
 
-  /* Special Attributes */
+  /* Non-standard MAC Atrributes*/
 
-  IEEE802154_ATTR_RADIO_REGDUMP = 0xF0,
+  IEEE802154_ATTR_MAC_DEVMODE,
 };
 
 /* Frame Type */
@@ -671,9 +675,10 @@ union ieee802154_macattr_u
 
 union ieee802154_phyattr_u
 {
-  uint8_t chan;
-  int32_t txpwr;
-  uint32_t symdur_picosec;
+  uint8_t   chan;
+  int32_t   txpwr;
+  uint32_t  symdur_picosec;
+  uint8_t   fcslen;
   /* TODO: Fill this out as we implement supported get/set commands */
 };
 
diff --git a/wireless/ieee802154/mac802154_device.c b/wireless/ieee802154/mac802154_device.c
index d223965d74c..63aef4c5031 100644
--- a/wireless/ieee802154/mac802154_device.c
+++ b/wireless/ieee802154/mac802154_device.c
@@ -450,11 +450,7 @@ static ssize_t mac802154dev_read(FAR struct file *filep, FAR char *buffer,
        */
     }
 
-  /* Check if the MAC layer is in promiscuous mode. If it is, pass the entire
-   * frame, including IEEE 802.15.4 header and checksum by assuming the frame
-   * starts at the beginning of the IOB and goes 2 past the length to account
-   * for the FCS that the radio driver "removes"
-   */
+  /* Check if the MAC layer is in promiscuous mode. */
 
   req.attr = IEEE802154_ATTR_MAC_PROMISCUOUS_MODE;
 
@@ -463,8 +459,18 @@ static ssize_t mac802154dev_read(FAR struct file *filep, FAR char *buffer,
 
   if (ret == 0 && req.attrval.mac.promisc_mode)
     {
-      rx->length = ind->frame->io_len + 2;
-      rx->offset = ind->frame->io_offset;
+      /* If it is, add the FCS back into the frame by increasing the length
+       * by the PHY layer's FCS length.
+       */
+
+      req.attr = IEEE802154_ATTR_PHY_FCS_LEN;
+      ret = mac802154_ioctl(dev->md_mac, MAC802154IOC_MLME_GET_REQUEST,
+                            (unsigned long)&req);
+      if (ret == OK)
+        {
+          rx->length = ind->frame->io_len + req.attrval.phy.fcslen;
+          rx->offset = ind->frame->io_offset;
+        }
 
       /* Copy the entire frame from the IOB to the user supplied struct */