diff --git a/ports/nrf/common-hal/os/__init__.c b/ports/nrf/common-hal/os/__init__.c
index 402b32bc50..7671cc2a51 100644
--- a/ports/nrf/common-hal/os/__init__.c
+++ b/ports/nrf/common-hal/os/__init__.c
@@ -28,13 +28,12 @@
 #include "py/mpconfig.h"
 #include "py/objstr.h"
 #include "py/objtuple.h"
-#include "py/qstr.h"
 
 #ifdef BLUETOOTH_SD
 #include "nrf_sdm.h"
 #endif
 
-#include "nrf.h"
+#include "nrf_rng.h"
 
 STATIC const qstr os_uname_info_fields[] = {
     MP_QSTR_sysname, MP_QSTR_nodename,
@@ -47,7 +46,6 @@ STATIC const MP_DEFINE_STR_OBJ(os_uname_info_release_obj, MICROPY_VERSION_STRING
 STATIC const MP_DEFINE_STR_OBJ(os_uname_info_version_obj, MICROPY_GIT_TAG " on " MICROPY_BUILD_DATE);
 STATIC const MP_DEFINE_STR_OBJ(os_uname_info_machine_obj, MICROPY_HW_BOARD_NAME " with " MICROPY_HW_MCU_NAME);
 
-
 STATIC MP_DEFINE_ATTRTUPLE(
     os_uname_info_obj,
     os_uname_info_fields,
@@ -63,28 +61,26 @@ mp_obj_t common_hal_os_uname(void) {
     return (mp_obj_t)&os_uname_info_obj;
 }
 
-bool common_hal_os_urandom(uint8_t* buffer, uint32_t length) {
+bool common_hal_os_urandom(uint8_t *buffer, uint32_t length) {
 #ifdef BLUETOOTH_SD
     uint8_t sd_en = 0;
     (void) sd_softdevice_is_enabled(&sd_en);
 
-    if (sd_en) {
-      return NRF_SUCCESS == sd_rand_application_vector_get(buffer,length);
-    }
+    if (sd_en)
+        return NRF_SUCCESS == sd_rand_application_vector_get(buffer, length);
 #endif
 
-    NRF_RNG->EVENTS_VALRDY = 0;
-    NRF_RNG->TASKS_START   = 1;
+    nrf_rng_event_clear(NRF_RNG_EVENT_VALRDY);
+    nrf_rng_task_trigger(NRF_RNG_TASK_START);
 
     for (uint32_t i = 0; i < length; i++) {
-      while (NRF_RNG->EVENTS_VALRDY == 0) {
-        ;
-      }
-      NRF_RNG->EVENTS_VALRDY = 0;
-      buffer[i] = (uint8_t) NRF_RNG->VALUE;
+        while (nrf_rng_event_get(NRF_RNG_EVENT_VALRDY) == 0);
+        nrf_rng_event_clear(NRF_RNG_EVENT_VALRDY);
+
+        buffer[i] = nrf_rng_random_value_get();
     }
 
-    NRF_RNG->TASKS_STOP = 1;
+    nrf_rng_task_trigger(NRF_RNG_TASK_STOP);
 
     return true;
 }