diff --git a/components/toolchain/system_nrf52.c b/components/toolchain/system_nrf52.c
index 9d4f4a4..641da3a 100755
--- a/components/toolchain/system_nrf52.c
+++ b/components/toolchain/system_nrf52.c
@@ -106,7 +106,7 @@ void SystemInit(void)
       reserved for PinReset and not available as normal GPIO. */
     #if defined (CONFIG_GPIO_AS_PINRESET)
         if (((NRF_UICR->PSELRESET[0] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos)) || 
-            ((NRF_UICR->PSELRESET[0] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos))){
+            ((NRF_UICR->PSELRESET[1] & UICR_PSELRESET_CONNECT_Msk) != (UICR_PSELRESET_CONNECT_Connected << UICR_PSELRESET_CONNECT_Pos))){
             NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
             while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
             NRF_UICR->PSELRESET[0] = 21;