diff --git a/libraries/mbed/targets/cmsis/TARGET_NORDIC/TARGET_NRF51822/system_nrf51822.c b/libraries/mbed/targets/cmsis/TARGET_NORDIC/TARGET_NRF51822/system_nrf51822.c
index e0d222937e..900b1fda2b 100644
--- a/libraries/mbed/targets/cmsis/TARGET_NORDIC/TARGET_NRF51822/system_nrf51822.c
+++ b/libraries/mbed/targets/cmsis/TARGET_NORDIC/TARGET_NRF51822/system_nrf51822.c
@@ -44,6 +44,18 @@ void SystemCoreClockUpdate(void)
 
 void SystemInit(void)
 {   
+    NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos);
+    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
+    }
+    //write FWID (NRF_UICR->FWID is readonly)
+    *(uint32_t *)0x10001010 = 0xFFFF0049;
+
+    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
+    }
+
+    NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);
+    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
+    }
     // Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required
     // to enable the use of peripherals" found at Product Anomaly document for your device found at
     // https://www.nordicsemi.com/. The side effect of executing these instructions in the devices