diff --git a/components/802.15.4_RF/atmel-rf-driver/source/NanostackRfPhyAtmel.cpp b/components/802.15.4_RF/atmel-rf-driver/source/NanostackRfPhyAtmel.cpp
index abb2ee93e91..be59a4afcd1 100644
--- a/components/802.15.4_RF/atmel-rf-driver/source/NanostackRfPhyAtmel.cpp
+++ b/components/802.15.4_RF/atmel-rf-driver/source/NanostackRfPhyAtmel.cpp
@@ -524,7 +524,7 @@ static void rf_if_reset_radio(void)
 #else
     rf->spi.frequency(MBED_CONF_ATMEL_RF_LOW_SPI_SPEED);
 #endif
-    rf->IRQ.rise(0);
+    rf->IRQ.rise(nullptr);
     rf->RST = 1;
     ThisThread::sleep_for(2);
     rf->RST = 0;
diff --git a/components/802.15.4_RF/mcr20a-rf-driver/source/MCR20Drv.c b/components/802.15.4_RF/mcr20a-rf-driver/source/MCR20Drv.c
index dc99f2d1b3c..90633a0205a 100644
--- a/components/802.15.4_RF/mcr20a-rf-driver/source/MCR20Drv.c
+++ b/components/802.15.4_RF/mcr20a-rf-driver/source/MCR20Drv.c
@@ -45,6 +45,7 @@
 #if defined(MBED_CONF_NANOSTACK_CONFIGURATION) && DEVICE_SPI && DEVICE_INTERRUPTIN && defined(MBED_CONF_RTOS_PRESENT)
 
 #include "platform/mbed_critical.h"
+#include <string.h>
 
 /*****************************************************************************
 *                               PRIVATE VARIABLES                           *
@@ -165,7 +166,7 @@ void MCR20Drv_DirectAccessSPIMultiByteWrite
 {
     uint8_t txData;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return;
     }
 
@@ -230,7 +231,7 @@ void MCR20Drv_PB_SPIBurstWrite
 {
     uint8_t txData;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return;
     }
 
@@ -301,7 +302,7 @@ uint8_t MCR20Drv_DirectAccessSPIMultiByteRead
     uint8_t  txData;
     uint8_t  phyIRQSTS1;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return 0;
     }
 
@@ -338,7 +339,7 @@ uint8_t MCR20Drv_PB_SPIBurstRead
     uint8_t  txData;
     uint8_t  phyIRQSTS1;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return 0;
     }
 
@@ -406,7 +407,7 @@ void MCR20Drv_IndirectAccessSPIMultiByteWrite
 {
     uint16_t  txData;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return;
     }
 
@@ -473,7 +474,7 @@ void MCR20Drv_IndirectAccessSPIMultiByteRead
 {
     uint16_t  txData;
 
-    if ((numOfBytes == 0) || (byteArray == 0)) {
+    if ((numOfBytes == 0) || (byteArray == NULL)) {
         return;
     }