diff --git a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52832/device/TOOLCHAIN_ARM_STD/nRF52832.sct b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52832/device/TOOLCHAIN_ARM_STD/nRF52832.sct
index ee364a7274..cafd145dc7 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52832/device/TOOLCHAIN_ARM_STD/nRF52832.sct
+++ b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52832/device/TOOLCHAIN_ARM_STD/nRF52832.sct
@@ -14,6 +14,10 @@
   #define MBED_RAM_SIZE 0x10000
 #endif
 
+#if !defined(MBED_CONF_TARGET_BOOT_STACK_SIZE)
+  #define MBED_CONF_TARGET_BOOT_STACK_SIZE 0x800
+#endif
+
 #define Stack_Size MBED_CONF_TARGET_BOOT_STACK_SIZE
 
 #define MBED_RAM0_START MBED_RAM_START
diff --git a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/device/TOOLCHAIN_ARM_STD/nRF52840.sct b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/device/TOOLCHAIN_ARM_STD/nRF52840.sct
index 85655bf5a8..a962dfc67d 100644
--- a/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/device/TOOLCHAIN_ARM_STD/nRF52840.sct
+++ b/targets/TARGET_NORDIC/TARGET_NRF5x/TARGET_NRF52/TARGET_MCU_NRF52840/device/TOOLCHAIN_ARM_STD/nRF52840.sct
@@ -14,6 +14,10 @@
   #define MBED_RAM_SIZE 0x40000
 #endif
 
+#if !defined(MBED_CONF_TARGET_BOOT_STACK_SIZE)
+  #define MBED_CONF_TARGET_BOOT_STACK_SIZE 0x800
+#endif
+
 #define Stack_Size MBED_CONF_TARGET_BOOT_STACK_SIZE
 
 #define MBED_RAM0_START MBED_RAM_START