diff --git a/ports/nrf/boards/microbit/modules/boardmodules.h b/ports/nrf/boards/microbit/modules/boardmodules.h
index 58df653e91..da50395280 100644
--- a/ports/nrf/boards/microbit/modules/boardmodules.h
+++ b/ports/nrf/boards/microbit/modules/boardmodules.h
@@ -29,9 +29,4 @@
 
 #include "modmicrobit.h"
 
-extern const struct _mp_obj_module_t microbit_module;
-
-#define BOARD_MODULES \
-    { MP_ROM_QSTR(MP_QSTR_microbit), MP_ROM_PTR(&microbit_module) }, \
-
 #endif // MICROPY_INCLUDED_NRF_BOARD_MICROBIT_BOARD_MODULES_H
diff --git a/ports/nrf/boards/microbit/modules/modmicrobit.c b/ports/nrf/boards/microbit/modules/modmicrobit.c
index b4cd3b4f18..bb721357de 100644
--- a/ports/nrf/boards/microbit/modules/modmicrobit.c
+++ b/ports/nrf/boards/microbit/modules/modmicrobit.c
@@ -156,3 +156,5 @@ const mp_obj_module_t microbit_module = {
     .base = { &mp_type_module },
     .globals = (mp_obj_dict_t*)&microbit_module_globals,
 };
+
+MP_REGISTER_MODULE(MP_QSTR_microbit, microbit_module, 1);
diff --git a/ports/nrf/modules/ble/modble.c b/ports/nrf/modules/ble/modble.c
index 2b6dd6e223..6726c63c48 100644
--- a/ports/nrf/modules/ble/modble.c
+++ b/ports/nrf/modules/ble/modble.c
@@ -102,4 +102,6 @@ const mp_obj_module_t ble_module = {
     .globals = (mp_obj_dict_t*)&ble_module_globals,
 };
 
+MP_REGISTER_MODULE(MP_QSTR_ble, ble_module, MICROPY_PY_BLE);
+
 #endif // MICROPY_PY_BLE
diff --git a/ports/nrf/modules/board/modboard.c b/ports/nrf/modules/board/modboard.c
index 647af5035b..45dd9f30ee 100644
--- a/ports/nrf/modules/board/modboard.c
+++ b/ports/nrf/modules/board/modboard.c
@@ -53,3 +53,5 @@ const mp_obj_module_t board_module = {
     .base = { &mp_type_module },
     .globals = (mp_obj_dict_t*)&board_module_globals,
 };
+
+MP_REGISTER_MODULE(MP_QSTR_board, board_module, 1);
diff --git a/ports/nrf/modules/music/modmusic.c b/ports/nrf/modules/music/modmusic.c
index e7e351f859..c8c6775de8 100644
--- a/ports/nrf/modules/music/modmusic.c
+++ b/ports/nrf/modules/music/modmusic.c
@@ -509,4 +509,6 @@ const mp_obj_module_t music_module = {
     .globals = (mp_obj_dict_t*)&microbit_music_locals_dict,
 };
 
+MP_REGISTER_MODULE(MP_QSTR_music, music_module, MICROPY_PY_MUSIC);
+
 #endif // MICROPY_PY_MUSIC
diff --git a/ports/nrf/modules/nrf/modnrf.c b/ports/nrf/modules/nrf/modnrf.c
index fc217b1d7e..ab7d043f46 100644
--- a/ports/nrf/modules/nrf/modnrf.c
+++ b/ports/nrf/modules/nrf/modnrf.c
@@ -95,4 +95,6 @@ const mp_obj_module_t nrf_module = {
     .globals = (mp_obj_dict_t *)&nrf_module_globals,
 };
 
+MP_REGISTER_MODULE(MP_QSTR_nrf, nrf_module, MICROPY_PY_NRF);
+
 #endif // MICROPY_PY_NRF
diff --git a/ports/nrf/modules/ubluepy/modubluepy.c b/ports/nrf/modules/ubluepy/modubluepy.c
index b306c065b2..d888b6dd51 100644
--- a/ports/nrf/modules/ubluepy/modubluepy.c
+++ b/ports/nrf/modules/ubluepy/modubluepy.c
@@ -67,4 +67,6 @@ const mp_obj_module_t mp_module_ubluepy = {
     .globals = (mp_obj_dict_t*)&mp_module_ubluepy_globals,
 };
 
+MP_REGISTER_MODULE(MP_QSTR_ubluepy, mp_module_ubluepy, MICROPY_PY_UBLUEPY);
+
 #endif // MICROPY_PY_UBLUEPY
diff --git a/ports/nrf/modules/uos/moduos.c b/ports/nrf/modules/uos/moduos.c
index e8a3790dac..ea60df7a66 100644
--- a/ports/nrf/modules/uos/moduos.c
+++ b/ports/nrf/modules/uos/moduos.c
@@ -196,3 +196,5 @@ const mp_obj_module_t mp_module_uos = {
     .base = { &mp_type_module },
     .globals = (mp_obj_dict_t*)&os_module_globals,
 };
+
+MP_REGISTER_MODULE(MP_QSTR_uos, mp_module_uos, 1);
diff --git a/ports/nrf/modules/utime/modutime.c b/ports/nrf/modules/utime/modutime.c
index bb29141011..6fe2da4746 100644
--- a/ports/nrf/modules/utime/modutime.c
+++ b/ports/nrf/modules/utime/modutime.c
@@ -54,3 +54,5 @@ const mp_obj_module_t mp_module_utime = {
     .base = { &mp_type_module },
     .globals = (mp_obj_dict_t*)&time_module_globals,
 };
+
+MP_REGISTER_MODULE(MP_QSTR_utime, mp_module_utime, 1);
diff --git a/ports/nrf/mpconfigport.h b/ports/nrf/mpconfigport.h
index 7a6e282e86..05e35956d9 100644
--- a/ports/nrf/mpconfigport.h
+++ b/ports/nrf/mpconfigport.h
@@ -226,65 +226,10 @@ extern const struct _mp_obj_module_t mp_module_uos;
 extern const struct _mp_obj_module_t mp_module_ubluepy;
 extern const struct _mp_obj_module_t music_module;
 
-#if MICROPY_PY_NRF
-#define NRF_MODULE                          { MP_ROM_QSTR(MP_QSTR_nrf), MP_ROM_PTR(&nrf_module) },
-#else
-#define NRF_MODULE
-#endif
-
-#if MICROPY_PY_UBLUEPY
-#define UBLUEPY_MODULE                      { MP_ROM_QSTR(MP_QSTR_ubluepy), MP_ROM_PTR(&mp_module_ubluepy) },
-#else
-#define UBLUEPY_MODULE
-#endif
-
-#if MICROPY_PY_MUSIC
-#define MUSIC_MODULE                        { MP_ROM_QSTR(MP_QSTR_music), MP_ROM_PTR(&music_module) },
-#else
-#define MUSIC_MODULE
-#endif
-
 #if BOARD_SPECIFIC_MODULES
 #include "boardmodules.h"
-#define MICROPY_BOARD_BUILTINS BOARD_MODULES
-#else
-#define MICROPY_BOARD_BUILTINS
 #endif // BOARD_SPECIFIC_MODULES
 
-#if BLUETOOTH_SD
-
-#if MICROPY_PY_BLE
-extern const struct _mp_obj_module_t ble_module;
-#define BLE_MODULE                        { MP_ROM_QSTR(MP_QSTR_ble), MP_ROM_PTR(&ble_module) },
-#else
-#define BLE_MODULE
-#endif
-
-#define MICROPY_PORT_BUILTIN_MODULES \
-    { MP_ROM_QSTR(MP_QSTR_board), MP_ROM_PTR(&board_module) }, \
-    { MP_ROM_QSTR(MP_QSTR_utime), MP_ROM_PTR(&mp_module_utime) }, \
-    { MP_ROM_QSTR(MP_QSTR_time), MP_ROM_PTR(&mp_module_utime) }, \
-    { MP_ROM_QSTR(MP_QSTR_uos), MP_ROM_PTR(&mp_module_uos) }, \
-    BLE_MODULE \
-    MUSIC_MODULE \
-    UBLUEPY_MODULE \
-    MICROPY_BOARD_BUILTINS \
-    NRF_MODULE \
-
-
-#else
-extern const struct _mp_obj_module_t ble_module;
-#define MICROPY_PORT_BUILTIN_MODULES \
-    { MP_ROM_QSTR(MP_QSTR_board), MP_ROM_PTR(&board_module) }, \
-    { MP_ROM_QSTR(MP_QSTR_utime), MP_ROM_PTR(&mp_module_utime) }, \
-    { MP_ROM_QSTR(MP_QSTR_uos), MP_ROM_PTR(&mp_module_uos) }, \
-    MUSIC_MODULE \
-    MICROPY_BOARD_BUILTINS \
-    NRF_MODULE \
-
-
-#endif // BLUETOOTH_SD
-
 // extra built in names to add to the global namespace
 #define MICROPY_PORT_BUILTINS \
     { MP_ROM_QSTR(MP_QSTR_help), MP_ROM_PTR(&mp_builtin_help_obj) }, \